图示梁受力相对中央截面C为反对称，则中央截面C的剪力和弯矩值分别为https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6fbcb0a17482419b8d0ae37ae36fafcc.png
举一反三
- 图示梁受力相对中央截面C为反对称，则中央截面C的剪力和弯矩值分别为https:/...8d0ae37ae36fafcc.png
- 图示梁，跨中C截面的剪力和弯矩值分别为https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/78cc4dcdec844770bd4978bb9d5ae342.png
- 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" />
- 外径为D、内径为d的空心圆轴，其扭转截面系数为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/af42d1bd70034c0d85f2f419a2839f22.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/2e74a84c10d14288a269b7b8def735f1.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/55aca62def3e4c9485e9b0894a63a342.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6ed4e2143b6a4c82ad03319473bb6a3a.png" />