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" />

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" />

一维谐振子处于<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7117096d5bb94d5abc582889ebf7ad5d.png" />态中,则该谐振子能量取值分别为 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/cb815c204bbb46ec8279a3382b927106.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/fce0d76351cb404da913e76852c23f0f.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/b67a8f55418347e78d9fe5fc37d245a8.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/de94246b2e7b4f57a297ff91789ec026.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" />

如右图所示拉杆头的挤压面积为( )。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7ddd21a3a4e849f68c4d176b971c7c55.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/df97de243a424ac58b1dc7cb70374683.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/eab41cb13f55410ea57bc67fbf155a7b.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/8c54a383f7e8426eb0f0f7c435a433ba.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/9120d45143384f29aef7b86ea444f7f3.png" />