设A=
，B=Р(Р(A)) 下列（ ）表达式不成立。
A:
B:
C:
D:
，B=Р(Р(A)) 下列（ ）表达式不成立。A:
B:
C:
D:
举一反三
- 下列电极电势最小的是： A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/dad3349a56e84119aff354de027c99e1.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/980bfc83fd624e14ab4d98cc5b6f71dd.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/a54b31ea021644c788a5c687342ced4d.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/8851284b569348549a0a28ded6b2cff1.png"/>
- 已知主视图和俯视图，下面左视图画法正确的有（ ）<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/2bcab5bbb4024d99b27781c7c286d861.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/c740df10c8d64a5c9f269c0808cfba30.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/d19031d8c17543f699d8827fa6ac1249.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/1780a38439af44618170b420943a6b6d.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/8b29c3cc4c2e4f3e919c5f22d4ac96f1.png" />
- 已知主视图和俯视图，下面左视图画法正确的有（ ）<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/0e67a6814bf3453d8a2560ad2803175b.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/9cbbab2efe124ef98699ab70b405efa7.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/43768386d66b41419559fe5bf0fb308d.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/3880af04e89d468c8c94acccd953d9c7.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/d4f57df49926458fba76fe114e40f01c.png" />
- 关于螺纹画法,正确的是 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/9ccba4619f94435c98b9ae7570b942d9.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/4bc6e6bda3eb4599aac46a7006ed3c17.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/cbdbd84b5748432d8d69e846b62109af.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/177c1236fbdd49ee899e6f362f3211e6.png" />
- 下面螺纹画法正确的有（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/154170f305f9495183d6eadbbfbc7526.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/5c82cb80164d4bff91f00d2433c71f8f.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/71ba69fdd015468dbb356bb55a217725.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/c510d567fcf749eb8b38b64b08a447d8.png" />