在如下六个螺纹连接视图中，选择出一个正确的视图。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/4feece7309094ae39917af46428e003e.png
举一反三
- 已知螺纹连接部件的主视图和左视图，请根据螺纹的规定画法，分别判断两个视图是否正确。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/b97593abec5e479d854519bc24087451.png
- 下图中，选择正确的左视图。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/54f9fbcd45d344d292fb482008cb789f.png
- 下面说法正确的是（ABD）。 A: 对给定的n×n常值矩阵A，有<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/303dacf53d6143c2b28f05f011cccd4d.png" /> B: 当A为对角线矩阵，即A=diag{<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/c6add3ff591a49618a099f987b66ac9b.png" />}时，有<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/daf51358ae6a4eefbdd513874b1f0024.png" /> C: 当A具有如下形式<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/d35669dfbff8484ea1da422c1c05a134.png" />,有<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/122dc0b2302840628b70f41d6200c101.png" /> D: 当A具有如下形式<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/061f1e154a43492c846419cd29919f63.png" />,有<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/fe069d53e0c74e3f863b774fd4c94ad0.png" />
- 下图中关于明度的 9 个等级中 4 、 5 、 6 为（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/2b413aefcae7477c8a09afb64b0827fe.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"/>