图示矩形截面梁，在（）处横截面上有最大正应力。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/1bc9b9734d0b4767874e9ffe5d6c2db6.png

图示矩形截面梁，在（ ）处横截面上有最大正应力。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/1bc9b9734d0b4767874e9ffe5d6c2db6.png

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" />

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

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"/>