举一反三
- 关于图示单元体属于哪种应力状态，正确的是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/0ce9566380e84711bd3d96d1cceb660a.png
- 如果图示平面应力状态单元体中的切应力改变方向，则（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/9007aa981ddd485aadc898fc57dc938f.png
- 对于图示单元体中的最大切应力 等于（ A ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/59b4c91aea1d48b584cb99e81b806067.png
- 关于图示梁中a点的应力状态是（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/fff83a50aca14ca09e656a1380d010a0.png
- 关于图示梁中a点的应力状态是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/fff83a50aca14ca09e656a1380d010a0.png
内容
- 0
图示危险点单元体的平面应力状态，按第三、第四强度理论的相当应力是（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/a3afa62ab3474f44b438ef2a5657f4c6.png
- 1
已知系统和初始条件<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/15eb73651c0a4ae094e6de902b6c21ca.png" />求初始状态激励的响应 ( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/d016acd038b04b699e76c2354357c3d2.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/7a10be8f1ce74599a610fd0b9b9eb195.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/4621f442538946fdb897b89a1461e1e1.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/61b797beffc74a99b91e1934af1372fb.png" />
- 2
下面状态空间描述是能控规范形的是（）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/c0f8e3a2d77a4fd08b4ada9a5b324293.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/8d770c43b50544c08938c1b531fb582b.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/e7ba776f14894872b1c52d35b99ac85b.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/cc8e514019f84f9ea16e37a59b1a3bb1.png" />
- 3
已知<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/43114282e941476ba93775909fb3f237.png"/>，用拉氏变换法求解微分方程<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/0db291610cb64fa8ad46ae0bd15476b0.png"/> 的结果为（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/29ff68f02bdd438bb2e16c2a6e1ec18b.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/0010c1593c9145a4b928548ab38cf426.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/1f562f2536584121b53c30e4db08df88.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/f593399cb630435192baa8b3e871b533.png"/>
- 4
已知串联支路为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/65b91bc067d14873a38d0c4675b53329.png"/> ， ，则其传递函数为（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/8bc361d7b437451dac5c0c42c3213311.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/7db9751653e24eba9f152b6937c8c256.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/a4b7ab7e122b40068ce6b78635486bae.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/a6b34e5a8a764d5c9b78c725d7b77ed4.png"/>