对称三相电路的有功功率的计算公式正确的是( )。
A:
B:
C:
A:
B:
C:
举一反三
- 如图所示电路的逻辑表达式F=（ ）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/8655693a417e4e43a32e0732ed533c96.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/beda73211aea49f082d9137fd4eb0526.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7388c99ee0824f20bcf85893934a2f6a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/9a5c81e78b344c79a9389e932a7f55ce.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/82193a9a030243728012b02e15718987.png" />
- 电路如图所示。则u01、u0与 uI的运算关系分别为（ ）、（ ）。 <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/418adfb996644706aef30b7d2841ccb9.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/ffe4934c2b0748428937c24c7ff16c3b.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/1da45f59ab0845f7be8cdc1f80a78caa.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/ca685a45d5764329b8551eb6eaeb6a58.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d3f91ade92954e7fbd65a917b04cc13b.png" />
- 剖视图正确的画法是 。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/9537d515da014e68a3d3cb450f99ad38.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/1a23c24f84774377874f0c38fd153a7e.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f5954dedb8bd4b788a4a43c7a11266a7.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/bd015ac5086848d3876260b7aaf6bfc5.png">
- 下列各表达式正确的是（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/c00e74606aff46b3bd686c1cbb405da6.gif" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/a9452605ec5b4dfc8fede5ae6baae903.gif" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/316677d9b4fe41d09b0ef5f8b18e4a0b.gif" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/1d4a5808f5524820897bf23dd439ad0c.gif" />
- 下列命名正确的是( ) A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/45d758d675564df2b279142c14ae9e2e.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/4889492bf6634f04b7c4e5c944f66ed8.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/70bc128530144f07aa006af0ebe6a989.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/ddcdceddcb9a49bf8ab24aea015a7a9a.png">