下列哪种条件下可以得到酚酯？
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 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">
- 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" />
- 设A=<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/bc546fc03fdb4ba3b7e6b144b6371d7f.png" />，B=Р(Р(A)) 下列（ ）表达式不成立。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/6e615703da60435893f9e9a9273e12e5.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/64c831067d054e71a6c76f43849d450d.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/72023a5250e44c12b98923044194f13d.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/c48e039a739c4502830eee7ae0ac1678.png" />
- 横桥的特性是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/d9109b1706b24ebdaaa4fd2ade011f0b.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/3e73caf4907c4732b31655818429fd1f.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/22fe3c7df73445cdbc78681845eb442f.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/dda726f3f23e497ea5706434c05ee729.png"> E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202003/1e933a32e7764e73841cf6d1ad056e95.png">