【单选题】下面四个化合物中的C=C伸缩振动频率最小的是( )。
A. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/453df589da8046d2b392ae5c3ceb5a23.png B. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/0fbda155caef493d801e984f75c322de.png C. h
A. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/453df589da8046d2b392ae5c3ceb5a23.png B. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/0fbda155caef493d801e984f75c322de.png C. h
举一反三
- 【单选题】布拉格方程的基本形式为( )。 A. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/a6ec2750c3ac451d83c2505168c54865.png B. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/8a62e42ecae14787a75f5b9f880aa191.png C. h
- 下列哪种条件下可以得到酚酯？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/08815fc33fa54872918d9948e274015a.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/2a317185ef5848c288253fefdf061c53.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/e629d22c3a094f97925f053969ec269b.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/6574cb35c64f41e4a3067c3838b2d19d.png" />
- 考虑装配工艺性时，下面的结构设计哪个工艺性好？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/f2ad0d06ed5c41e685c2df77f3a0db97.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/23d3dd266a4545b2a553fb240f081a3c.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/6227d2f7b1bb449198d01b39253ae074.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/66650c819dc14c1ba115356d0476d0ee.png">
- 在切削加工中，考虑刀具在加工过程中的位置，下面哪个结构设计是合理的？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/3791e259796b403caaaff50a30f8f7f9.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/8f93d957816f4306b7b3f76c3c101fcc.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/92fbd574050e4dd68e74805b7c6d37ae.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202005/d9a086e1f3d043cc9ab5c293dbbf572c.png">
- 【单选题】 https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/be590f3923594751b5e040cc4455a1ed.png A. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/e3b8437f44434853b0bb5f2a51b16872.png B. https://image.zhihuishu.com/zhs/onlineexam/ueditor/202008/3b889237e58846f28fc8cf2434bd061a.png C. h