A:
B:
C:
D:
举一反三
- 通电延时时间继电器的线圈图形符号为（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/783d4e013daa4f7384730ae4c5a54005.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/401007c00c3d4e8badd1c54da42a55a9.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/ac90a5663c3c4f51b28a33db3803f091.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/e66d824c1ee2489db43385dfe2e35599.png" />
- l-矩阵<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/500186eca47a45dfbdb56b3f454593c8.png" />的Smith标准形为()。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/29463535c69144b08617f313e85b7d59.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/be82c74bd5e6499b9c4bd798f704df00.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/509e3bfd1b114727974787c7f1dab1a9.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/777d67f69e83438f95215aa7434519d5.png" />
- 下列化合物命名正确的是： A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/7edd2de514754adebb8fd41f2e3745b9.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/87e72f99416449fd8aeac22844518d5c.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/bc9cd89438694bdbbc585f1eea17dced.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/3a5edc8ac0ab4b97b781f76c36e1d75e.png" />
- 劳动（L）的总产量下降时( ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/76b56ea415c443cca8a15904fc96c163.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/1d3a1a6edbbf48829cf2b8219bcee903.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/8b96eb0faabc4175aacb9c02aaedc8a3.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/4509f4a8c33a4321befc1ad8d4f56d1d.png" />
- 下列关于超额Gibbs自由能GE关系式正确的是（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/e5a354f933964f478cab36c4a5664ec7.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/362898be0acb4a349cc34f8670f8a388.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/e9c25463a6ca414c84033d2faf09442f.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/0c7c77806ddf400db97e3f502733280a.png" />
内容
- 0
下列逻辑等式哪些是正确的。（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/fb32e6d108fa4b70813a106236163c2e.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/1b961d6609ad4ba1aba46badb48e054a.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/b261757ec7464a438be461f017ef58c1.png"> D: A+AB=A
- 1
质点的运动学方程为x=3t, y=4t2,它在t时刻的速度矢量为 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/66e1eb9ddd424b6b8d87c9075674e17f.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/9c02e87e76e142df945fb066bd6683bf.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/226f38e5f86b432386fd54045299c691.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/2d5ac12518a74ef78acfcc804baf219e.png">
- 2
下列函数既可用初值定理求其初值又可用终值定理求其终值的为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/c0d0aae9fb9a481f896ed34e749cf1cf.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/8d9a5855881246e99f2f8f59ae86777e.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/a567ca44e62e4194a9c152228c6c78b4.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/da03b0863958465ebd3f1c53a4d252b5.png">
- 3
恒温热源温度为 T1 恒温冷源温度为 T2 ，环境温度为 T0 ，热源提供热量 Q1 中的有效能（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/589db50a3273486492fd485153c10b69.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/5213b3f87eb1445ba9fff0e013545823.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/10bb86460c254dccbef1dc37b789224a.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/d12ce28fefac4fb1b94d2915f0942cc2.png" />
- 4
一点电荷q位于边长为d的立方体的顶角上，通过与q相连的三个平面的电通量是 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/1773fdeb5f8b45fca83755c5c7891ce9.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/8c7716bb55b34f8dbd105fd257329b1f.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/488eec21d5ad4373a6793fe6f4a6503e.png"> D: 0