https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/c0ac7569520f4f2bbb27e630f47f6fea.png
举一反三
- 以下四个图所示的力三角形，哪一个图表示力矢R是F<sub>1</sub>和F<sub>2</sub>两力矢的合力矢量 （ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/e5882668f0e84059a814aa855a51c3f6.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/7ce37cfeee134a2a8e6cef983a8c334e.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/3c0b7ba6eaa14d0597864d403938923d.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/bd13812c38674e828a05477ef3fa6c61.png"/>
- 以下哪个家具是衣架。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/02285e456e2b4861a7f6319515f836c4.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/19a30f3b6d6846ceab656f4ea0e7eb9d.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/e14dbac89fea4066a9ae7bbd6d1dc080.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/612475075e2d434aac0d404ce94395ea.png" />
- 设F，G都是4阶方阵，且https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/9e4118a038754e759762167b0732cca0.png
- 设二极管的端电压为U，则二极管的电流方程为（ ） 。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/8fc1bd7f467e423a9abedfbcf36b63bf.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/96c0065cd93f445abe2243c79b5a11f5.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/e7babcc7dd7c478bbabd8438754ba07b.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/dc06cb808c2a4d20b75fa70ba39feefe.png">
- 给定下述系统的差分方程，则__是非因果系统。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/df1ece1947ea4ec394f9801bb6a8623e.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/4963ffe14fd64ba983b60ad14bd498e2.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/3c6bc338aedb4d04baa637de5d7d9506.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202006/53dbdd529a5443188250b588e1de8d36.png">