《理论力学》在线作业二

adminhan

&nbsp;<img alt="" width="603" height="242" src="http://file.open.com.cn/ItemDB/42634/ffa712e0-df9c-41d5-b987-7b302b0d0225/2016531204027849.png" />
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="614" height="259" src="http://file.open.com.cn/ItemDB/42634/a6d9525e-2c59-46fe-ad23-ad11ec167eb7/201653120222387.png" />
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="573" height="234" src="http://file.open.com.cn/ItemDB/42634/97fc7360-4a5b-4116-9afa-15a76660406a/2016531205814777.png" />
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="583" height="284" src="http://file.open.com.cn/ItemDB/2016531195945157.png" />
A:A
B:B
C:C
D:D

1<img width="658" height="549" alt="" src="http://file.open.com.cn/ItemDB/42634/99ce3f60-041d-4f86-885e-12784575d592/2016531203154615.png" />
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="589" height="192" src="http://file.open.com.cn/ItemDB/42634/82116cb5-6802-4fee-89ab-8647be5422f9/201653120051195.png" />
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="604" height="373" src="http://file.open.com.cn/ItemDB/42634/76c7ddae-2311-4a62-a8ac-e1f4f4d92e89/2016531201442876.png" />
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="611" height="333" src="http://file.open.com.cn/ItemDB/20165312022718.png" />
A:A
B:B
C:C
D:D

<p>&nbsp;<img alt="" width="625" height="434" src="http://file.open.com.cn/ItemDB/42634/9a4e129b-6e86-4784-baa9-612528828a2a/2016531203125178.png" /></p>
A:A
B:B
C:C
D:D

&nbsp;<img alt="" width="615" height="402" src="http://file.open.com.cn/ItemDB/42634/57d1a415-c5ab-4f39-9656-aa8857b98358/201653116621811.png" />
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'">零杆是桁架在某种载荷情况下内力为零的杆件，因此，它可以从桁架中去掉</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">作用于刚体上的力向其它点平移时，必须增加一个附加力偶，附加力偶的力偶矩等于原力对平移点之矩。</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">静定桁架就是在载荷作用下形状保持不变的桁架</span><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">。</span></p><!--EndFragment-->
A:错误
B:正确

&nbsp;<img alt="" width="602" height="73" src="http://file.open.com.cn/ItemDB/42634/e18242d8-2412-46f1-8cdf-4df69d13fc1f/201653122304348.png" />
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">力可以沿着作用线移动而不改变它对物体的运动效应。</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">力偶中的两个力对于任一点之矩恒等于其力偶矩，而与矩心的位置无关</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">平面汇交力系的主矢就是该力系之合力。</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">在空间问题中，力对轴的矩是代数量，而对点的矩是矢量。</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">力偶只能使刚体转动，而不能使刚体移动。</span></p><!--EndFragment-->
A:错误
B:正确

<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: '宋体'; FONT-SIZE: 10.5pt; mso-spacerun: 'yes'">三力平衡定理指出：三力汇交于一点，则这三个力必然互相平衡。</span></p><!--EndFragment-->
A:错误
B:正确