20春学期《钢结构（一）》在线平时作业3

adminhan

<img width="822" height="290" alt="" src="http://file.open.com.cn/ItemDB/65637/bd7f407e-2c66-4f8c-882d-61002bb2a2a4/20103115418633.jpg" />&nbsp;
A:A
B:B
C:<p>C</p>
D:D

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">单轴对称轴心受压柱，绕非对称轴的失稳，一般为</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">弯曲失稳</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">扭转失稳</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">弯扭失稳</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">第一类失稳</span>

<img width="721" height="413" alt="" src="http://file.open.com.cn/ItemDB/65637/925eef47-6667-421e-b428-720c4c5e4e82/2010312161443.jpg" />&nbsp;
A:A
B:B
C:C
D:D

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">采用螺栓连接时，构件发生冲剪破坏，是因为</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">_______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">栓杆较细</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">钢板较薄</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">截面削弱过多</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">边距或栓间距太小</span>

<img width="573" height="38" alt="" src="http://file.open.com.cn/ItemDB/65637/f627b724-2dd7-485a-b635-9c3102b4534d/201031232437171.jpg" />&nbsp;
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">处于弹性工作阶段</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">不会丧失整体稳定</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁的局部稳定必定满足要求</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁不会发生强度破坏</span>

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在钢结构的构件设计中，认为钢材屈服点是构件可以达到的</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">___________</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">最大应力</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">设计应力</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">疲劳应力</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">稳定临界应力</span>

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">为防止钢构件中的板件失稳而设置加劲肋，这一做法是为了</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">改变板件的宽厚比</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">增大截面面积</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">改变截面上的应力分布状态</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">增加截面的惯性矩</span>

<img width="646" height="111" alt="" src="http://file.open.com.cn/ItemDB/65637/f712cab5-7734-4be5-ac24-3578e5d8e807/20103120558670.jpg" />&nbsp;
A:A
B:B
C:C
D:B

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁受固定集中荷载作用，当局部压应力不能满足要求时，采用</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">是较合理的措施。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">加厚翼缘</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在集中荷载作用处设支承加劲肋</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">增加横向加劲肋的数量</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">加厚腹板</span>

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在承受动力荷载的结构中，垂直于受力方向的焊缝不宜采用</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">角焊缝</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">焊透的对接焊缝</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">不焊透的对接焊缝</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">斜对接焊缝</span>

<img width="974" height="371" alt="" src="http://file.open.com.cn/ItemDB/65637/841954c0-e53f-4329-bb81-1f0ccbba9de9/2010320229471.jpg" />&nbsp;
A:A
B:B
C:C
D:D

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">焊接结构的疲劳强度的大小与</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">关系不大。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">钢材的种类</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">应力循环次数</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">连接的构造细节</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">残余应力大小</span>

<img width="718" height="71" alt="" src="http://file.open.com.cn/ItemDB/65637/cfcc2518-dbfb-4695-9fec-bdfe6d207219/201031205737173.jpg" />&nbsp;
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">厚度</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">有效厚度</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">名义厚度</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">焊脚尺寸</span>

<img width="856" height="69" alt="" src="http://file.open.com.cn/ItemDB/65637/f35b0f72-bfb2-4d9a-a103-38eaca11246d/201031233029224.jpg" />&nbsp;
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁中和轴以上截面对梁中和轴的面积矩</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁上翼缘</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> </span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">或下翼缘、截面对梁中和轴的面积矩</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁上、下翼缘对梁中和轴的面积矩之和</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">梁上翼缘</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> </span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">或下翼缘、截面对腹板边缘线的面积矩</span>

在充分发挥材料强度的前提下，如其他条件均相同，Q235钢梁的最小高度<em>h</em>_min______Q345钢梁的<em>h</em>_min。
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">大于</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">小于</span>
C:<p>等于</p>
D:不确定

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在下列因素中，</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">________</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">对压杆的弹性屈曲承载力影响不大。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">压杆的残余应力分布</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">构件的初始几何形状偏差</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">材料的屈服点大小</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">荷载的偏心大小</span>

<img width="945" height="370" alt="" src="http://file.open.com.cn/ItemDB/65637/a87c0f37-b489-40a2-a7b7-954f60845ee5/2010312132755.jpg" />&nbsp;
A:A
B:B
C:C
D:D

<p><img width="846" height="132" alt="" src="http://file.open.com.cn/ItemDB/65637/fe94a5a0-52b3-4a47-b48e-1556cd252d85/20103115306800.jpg" />&nbsp; </p>
A:A
B:B
C:C
D:D

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">钢材中的有害元素主要是指</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">_______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">N</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">O</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">S</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">P</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">N</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">O</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">Ni</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">Mn</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">O</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">P</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">Mn</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 'Times New Roman'">、</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">Ti</span>

<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">对于直接承受动力荷载的结构，下列荷载取值正确的是</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US">______</span><span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在计算强度时，动力荷载设计值应乘以动力系数；在计算稳定性、疲劳和变形时，动力荷载标准值不应乘以动力系数</span>
B:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在计算强度和稳定性时，动力荷载设计值应乘以动力系数；在计算疲劳和变形时，动力荷载设计值不应乘以动力系数</span>
C:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在计算强度、稳定性和疲劳时，动力荷载设计值应乘以动力系数；在计算变形时，动力荷载标准值不应乘以动力系数</span>
D:<span style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在计算强度和稳定性时，动力荷载设计值应乘以动力系数；在计算疲劳和变形时，动力荷载标准值不应乘以动力系数</span>