两个半电池，电极相同，电解质溶液中的物质也相同，都可以进行电极反应，但溶液的浓度不同，它们组成电池的电动势（ ）。
A:
=0，E≠0
B:
≠0，E=0
C:
≠0，E≠0
D:
=0，E=0
A:
=0，E≠0B:
≠0，E=0C:
≠0，E≠0D:
=0，E=0
举一反三
- 某反应在标准态和等温等压条件下，在任何温度都能自发进行的条件是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/63c6a7b5b3114c1095cb68d96ebd27ec.png" />< 0，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d11dd437fcbe440d886e25a9a04f2c0e.png" />> 0 B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/63c6a7b5b3114c1095cb68d96ebd27ec.png" />> 0，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d11dd437fcbe440d886e25a9a04f2c0e.png" />> 0 C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/63c6a7b5b3114c1095cb68d96ebd27ec.png" />> 0，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d11dd437fcbe440d886e25a9a04f2c0e.png" />< 0 D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/63c6a7b5b3114c1095cb68d96ebd27ec.png" />< 0，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d11dd437fcbe440d886e25a9a04f2c0e.png" />< 0
- 如图所示，离心机通风机借集流器从大气中吸入空气。若插入盛水容器的玻璃管中的水上升高度为h，则通风机流量<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/b90be52d519d4880a560e59df52dd29c.png" />=（）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/dca2260bbd5c4051b28bbb87ae1d6de9.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7b4225635cfe41e28af202418785be8d.png" border="0" vspace="0" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/05404534275442c597194a44ee9f46f7.png" border="0" vspace="0" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/5509cc1799e54c64a7a11a7f37417710.png" border="0" vspace="0" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/307ded8ddb2c486d935b6bc79faa7688.png" border="0" vspace="0" />
- 由角系数性质，任意两表面间的角系数有下列关系（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/8fe9f71498f04232b7d9626ea192f5d5.png" border="0" vspace="0" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d2b63ba506614bfab0e0d91b5a62b9bd.png" border="0" vspace="0" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f88fb5553ef147e996473ea8d738144e.png" border="0" vspace="0" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/3bb42a34fc7943abb899e6ad38246778.png" border="0" vspace="0" />
- 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" />
- 无限长直导线在P处弯成半径为R的圆，当通以电流I时，则在圆心O点的磁感强度大小等于<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/247132caa86643248801a9ce73153643.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d6ca935b43b5409982580c397b20452a.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/05df5ede8d854c86adb4aa49ab7d213a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/fd586a02dd0d48d2a9d8451722bd0cc8.png" /> D: 0 E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/5b15cee769754f5b8d999d9c5bb28961.png" />