图示力F=2kN对Ａ点之矩为（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/24ee428f91c546e296032ec821305836.png
举一反三
- 中国大学MOOC:图示力F=2KN对Ａ点之矩为（）kN·m。【图片】
- 力F作用在边长为a的正方形侧表面CDEG的对角线EC上，该力对x轴之矩等于 ()。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/05b9a0ac85914726b3b27ff224bac3fe.png
- 图示力F=2KN，对Ａ点之矩为（ ）kN·m [img=153x79]1803a08583019ec.png[/img] A: 2 B: 4 C: -2 D: -4
- 图示力F=2KN对A点之矩为（）kN•m。 A: 2 B: 4 C: －2 D: －4
- 图示螺钉在拉力F作用下。已知材料的剪切许用应力[τ]和拉伸许用应力[σ]之间的关系为：[τ]=0.6[σ]。试求螺钉直径d与钉头高度h的合理比值。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/ea5aac2943c148f0898270443ef13de6.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/aa9810483bad40828ce87767240d1292.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/020a3681565242b99d12bf523efb96ad.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/337cbe73f1c7414b888c54365465b39d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/eb5408a49bfd47db91aaf04e7780d90c.png" />