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在均匀电场中，作一半径为R的半球面，使半球面的轴与场强E的方向平行，则通过这一半球面的电通量为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/bf341a312be54f3c99c3472135e65b4d.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/75062c5d50c24d6684010689732915ac.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/47e2f56b1f234526a7582ca537740bcc.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/5284cd2d979041baaed0b04028cfb72b.png" />

设A的特征多项式，则（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/7928939449af426f8522a94f938f5050.png

组合梁如图示。已知q=2kN/m ， F=10kN , 求固定端 A 处的约束力偶 M A 等于 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/3dc88c1d09c94a299948b91b63cfed38.png

在图示三铰拱结构的两半拱上，各作用等值反向的两力偶M。约束力FRB为 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/5ab0e7e799f548e79ff9a19b0d4f274c.png

均质圆盘C质量为m，半径为r，在半径为R的圆弧形轨道上纯滚动，轮心C点速度v为常数；则在图示瞬时圆盘对C轴的动量矩大小为（ ）<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/4f2a21f5641e442aa7af905c5ad08bd6.png" /><img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/1ed8790882b54d5cb39ed37af07e4f96.png" /> A: 选项A B: 选项D C: 选项B D: 选项C

图示半径为R,质量为m1的均质滑轮上,作用一常力偶M,提升一质量为m2的重物,则重物上升高度h的过程中,力偶M的功为_______<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/724ffab09d304be78a3a0c11f3720101.png" /><img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/85bce1f2cfca4096ba659a0777799966.png" /> A: 选项D B: 选项B C: 选项A D: 选项C

环D的质量为m, OA=r,图示瞬时直角拐杆角速度为w,则该瞬时环的动能为_______http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/46d167239d1748ed9029623994d08e1b.png