A:
B:
C:
D:
举一反三
- 下列化合物能发生Hoffmann重排反应的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/48290165247643e1aac1067c27f0cfce.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/04103b28f4ec4c5f8d28d8f8392e143f.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/80cb1b0a7023476496199ba53a5f28f3.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/72d151e6a82943c6b11abdffa60b68c0.png" />
- 下列函数中为奇函数的是( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7d0e4f5547744249b8c4c0e6db0e62fc.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d19abeb7724248dca0a0c1b8017897db.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3f5cff0b4a9b441da3b9e75bd446c141.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d59a9db29be640a899356a3f1645a0dd.png">
- 下列基团中吸电子能力最强的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/18902949ac9142beb6b84407debff192.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c5ceca45d0dc49789321fba46295c6f9.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d87661c43e124df88ce64fc1c55932b7.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/69c2916d66284096b7c7f1a2a26242da.png" />
- 在四阶行列式的展开式中，下列各项中带正号的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/158559e94ae84536851f378e695766bb.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e8261729bcf04dd7ac6f192652f99b12.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/13225b1635fb485abb17dff408bd73ad.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e205784d50a344d391c347f37d428eb7.png">
- 根据瞬时速度矢量的定义，在直角坐标系下，其大小可表示为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/216af49737494503bcc60d629711590e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/61bf4252ab7143dd963055ac61528d9d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/be254f5fb29d44669cf22d6edc9399c0.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/2692ac1ea4ef4ce3a928606065a9086c.png" />
内容
- 0
会使红细胞发生溶血的溶液是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/1fde1a8472db47c487a3f3a7dfbb15d9.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/f6a95d1eb350439a83e5ca72a1ee06e4.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/9cecb935756e42ee82deae34093595f4.png"> D: 生理盐水和10倍体积水的混合液
- 1
图示应力圆对应于应力状态<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a61d48f304e9454fb6f3d8fcac0a5888.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/fa83fd043ee946869755b338236b2b0e.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/77ff74928a3642928e805440db706068.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6cce8e25b7ec4d00895cd86fabc16f64.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/62d9a4357886450cbfb0bde0deda67ec.png" />
- 2
在纯电容电路中，电压和电流的关系应为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3e829c34dee64700a6d7c47703fac813.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/76f4755b138c42dcb27c8c006369dd09.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/99d49adf0f7142ef91f9c78e42ba24b0.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d5322333240046d382b302f48318d1cb.png"> E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c5689885a941415493404a53dbf5e03b.png">
- 3
在纯电感电路中，电压应为（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/fe9a2726638343cf8f66ce58ca5146cc.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0f360aa88e6d4c1993733df279cd3734.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/08dcf081ff844b1e92735fc0b9d1a227.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/344144b6bd8f4089899e73bd6daadc00.png">
- 4
欠阻尼二阶系统的闭环极点分布图为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e26de5d73f984ba391a6ac30d8c6d4fe.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/11aa916316d34c4eb0ae8cafd3bdaeb0.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/31e7b12aeb2e427f882a4b430c6f6d94.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/aa587a3419434ed38f3114ee0eeaba96.png" />