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" />

下列草图用旋转特征工具不能生成实体的是（）。1、<img width="50" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0c0ba8db9acf4933a0e5df79d9dddaea.png" border="0" vspace="0 &nbsp; &nbsp;&nbsp; 2、<img width="60" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/341180a27efb4211b512ab4269ae865a.png" border="0" vspace="0 &nbsp; &nbsp;&nbsp; 3、<img width="80" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/97007edcda2644d78d09b1089aa9af7a.png" border="0" vspace="0 &nbsp; &nbsp;&nbsp; 4、<img width="80" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6a56890b40874f78a8df75419e014d27.png" border="0" vspace="0

如图示并联管路，已知各支路的沿程阻力系数之比为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6e209020d20f4543823ce6516ae8ca06.png" />，管长之比为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/50814fe028094040bc955d8e1542b6d2.png" />，且<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/40b4c6a9565b483590c5c7d607e7ed66.png" />，则两支管的流量之比<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/1055534bfce6426a94682ba086a5b17e.png" />=（）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/77815369f5cd41f3a2e68b9524b454c5.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/0cd231eebe45465f941a0f614743e6d2.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7555afa5223e40bf89ca575cf7b52754.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/1b06cd474b844644a6d97ad87d208e94.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d0b2bca045414236a7d1c9925a9264f2.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" />

下列积分中等于零的是 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/beafcd1bd9a045e4bef379cba1d6c572.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/fc2d4b861cbf43eb8a27dde67b97f680.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d9c33bed53f147c4b62a3f7553d496e0.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/4e50aaa9bf42400db5b7573935fc97e4.png" />