20春学期《工程力学X》在线平时作业1

adminhan

<p>选择题1</p><p><img alt="" src="http://file.open.com.cn/ItemDB/43582/497e2686-138c-4ca8-9933-ace234ebecea/2009519203626939.png" /></p>
A:A
B:B
C:C
D:D

<p>选择题2</p><p><img alt="" width="356" height="59" src="http://file.open.com.cn/ItemDB/43582/fd2eac1b-a5a5-4bed-a8b0-9cff800f07ce/2009519203927267.png" /></p>
A:A
B:B
C:C
D:D

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">剪切面和挤压面是相同的。（&nbsp;&nbsp;&nbsp;&nbsp;）</span></p><!--EndFragment-->
A:对
B:错

<p>选择题3</p><p><img alt="" width="221" height="95" src="http://file.open.com.cn/ItemDB/43582/c74cda77-858e-473c-b4fc-3cbe635fa9cd/2009519204016611.png" /></p>
A:A
B:B
C:C
D:D

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">用叠加法计算组合变形杆件的内力和应力的限制条件是</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'"><o:p></o:p></span></p><!--EndFragment-->
A:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">任何情况；&nbsp;</span></p><!--EndFragment-->
B:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">弹塑性变形；</span></p><!--EndFragment-->
C:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">弹性变形；</span></p><!--EndFragment-->
D:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">线弹性和小变形</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">.</span></p><!--EndFragment-->

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">一圆轴危险截面的内力有轴力</span><span style="FONT-STYLE: italic; FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">F</span><span style="FONT-STYLE: italic; FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; VERTICAL-ALIGN: sub; mso-spacerun: 'yes'">N</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">、扭矩</span><span style="FONT-STYLE: italic; FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">T</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">和弯矩</span><span style="FONT-STYLE: italic; FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">M</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">，其强度条件为</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span></p><p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">A<img alt="" width="205" height="60" src="http://file.open.com.cn/ItemDB/43582/57b11be0-c61b-4c30-b020-ec2d45169e23/20091012112723357.png" /></span></p><p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">B<img alt="" width="202" height="60" src="http://file.open.com.cn/ItemDB/43582/57b11be0-c61b-4c30-b020-ec2d45169e23/20091012112736107.png" /></span></p><p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">C<img alt="" width="168" height="60" src="http://file.open.com.cn/ItemDB/43582/57b11be0-c61b-4c30-b020-ec2d45169e23/20091012112748544.png" /></span></p><p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">D<img alt="" width="221" height="61" src="http://file.open.com.cn/ItemDB/43582/57b11be0-c61b-4c30-b020-ec2d45169e23/2009101211282919.png" /></span></p><p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'"></span></p><!--EndFragment-->
A:A
B:B
C:C
D:D

<p>选择题3</p><p><img alt="" width="397" height="201" src="http://file.open.com.cn/ItemDB/43582/9f07057f-1521-4f8e-b6c4-1bac094fc61a/2009519202156549.png" /></p>
A:A
B:B
C:C
D:D

<p>选择题3：</p><p><img alt="" width="393" height="114" src="http://file.open.com.cn/ItemDB/43582/7dcd3328-0c28-40e7-b602-e92865b9492e/2009519202732939.png" /></p>
A:A
B:B
C:C
D:D

<div>利用平衡条件求未知力的步骤，首先应(&nbsp;&nbsp;&nbsp;&nbsp;)。 </div>
A:<div>&nbsp;&nbsp;&nbsp;&nbsp;取隔离体</div>
B:&nbsp;&nbsp;&nbsp;&nbsp;作受力图
C:&nbsp;&nbsp;&nbsp;&nbsp;列平衡方程&nbsp;&nbsp;&nbsp;&nbsp;
D:求解

<p>选择题2</p><p><img alt="" width="381" height="57" src="http://file.open.com.cn/ItemDB/43582/294e476b-5000-4a50-bba3-b5e48aa64495/2009519202041142.png" /></p>
A:A
B:B
C:C
D:D

<p>选择题2</p><p><img alt="" width="400" height="159" src="http://file.open.com.cn/ItemDB/43582/b36caff0-b86b-4935-9dde-57f385b7329d/2009519202648111.png"></p>
A:A
B:B
C:C
D:D

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">弯曲内力剪力和弯矩的符号是根据</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">规定的。</span></p><!--EndFragment-->
A:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">坐标轴的方向；&nbsp;</span></p><!--EndFragment-->
B:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">外力的方向</span></p><!--EndFragment-->
C:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">变形的方向</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; FONT-WEIGHT: bold; mso-spacerun: 'yes'">.</span></p><!--EndFragment-->

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">判断静不定梁的条件是</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span></p><!--EndFragment-->
A:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">约束反力的数目等于平衡方程的数目</span></p><!--EndFragment-->
B:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">约束反力的数目小于平衡方程的数目</span></p><!--EndFragment-->
C:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">与约束反力和平衡方程数目无关；</span></p><!--EndFragment-->
D:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">约束反力的数目大于平衡方程的数目</span></p><!--EndFragment-->

<p>选择题1</p><p><img alt="" width="367" height="21" src="http://file.open.com.cn/ItemDB/43582/0e411256-b5d2-40d7-bd43-0db4fd5bcc5f/2009519201914783.png" /></p><p><img alt="" width="398" height="97" src="http://file.open.com.cn/ItemDB/43582/0e411256-b5d2-40d7-bd43-0db4fd5bcc5f/2009519201928924.png" /></p>
A:A
B:B
C:C
D:D

<p>选择题1</p><p><img alt="" src="http://file.open.com.cn/ItemDB/43582/a48d4f5a-6e1f-43d9-8c13-b91c70f8fe26/2009519202523736.png" /></p>
A:A
B:B
C:C
D:D

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">低碳钢的强度比合金钢的强度低。</span></p><!--EndFragment-->
A:对
B:错

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">应用叠加法求挠度的条件是</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span></p><!--EndFragment-->
A:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">变形在线弹性范围；</span></p><!--EndFragment-->
B:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">载荷与挠度是线性关系、变形在线弹性范围；&nbsp;</span></p><!--EndFragment-->
C:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">载荷与挠度是线性关系；&nbsp;&nbsp;&nbsp;</span></p><!--EndFragment-->
D:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">任何情况</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">.</span></p><!--EndFragment-->

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">拉伸与扭转组合变形、弯曲与扭转组合变形，它们的强度条件相同。（&nbsp;&nbsp;&nbsp;&nbsp;）</span></p><!--EndFragment-->
A:对
B:错

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">挤压和压缩变形是相同的。（&nbsp;&nbsp;&nbsp;）</span></p><!--EndFragment-->
A:对
B:错

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">度量弯曲变形的尺度是</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">，它要求挠曲线</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'"><o:p></o:p></span></p><!--EndFragment-->
A:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">挠度、连续；</span></p><!--EndFragment-->
B:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">挠度和转角、光滑连续</span></p><!--EndFragment-->
C:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">转角、光滑</span></p><!--EndFragment-->
D:<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">挠度和转角、连续函数</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">.</span></p><!--EndFragment-->

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">空间平行力系的平衡方程为三个：<img alt="" width="213" height="28" src="http://file.open.com.cn/ItemDB/43582/3747ac02-e274-4315-986a-8957f7c1590a/20091012105529860.png" /></span></p><!--EndFragment-->
A:对
B:错

<p>选择题2</p><p><img alt="" width="408" height="151" src="http://file.open.com.cn/ItemDB/43582/910b70ee-11df-4afc-a5e4-52a5931b6fdf/2009519203211799.png" /></p>
A:A
B:B
C:C
D:D

<div>下列关于连接件的剪切强度采用实用计算的说法哪个是正确的？（&nbsp;）</div>
A:<div>连接件的应力分布简单；</div>
B:连接件结构形式简单；
C:连接件的应力分布复杂；
D:连接件结构形式复杂。

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">空间汇交力系的平衡方程为三个投影式：<img alt="" width="200" height="28" src="http://file.open.com.cn/ItemDB/43582/62a6ec70-b778-41d5-9fc8-36df82ded53a/20091012105446407.png" /></span></p><!--EndFragment-->
A:对
B:错

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">在分布载荷作用处，剪力图是斜直线。（&nbsp;&nbsp;&nbsp;&nbsp;）</span></p><!--EndFragment-->
A:对
B:错