举一反三
- 我国健康成年人血小板总数是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/fecfc3776aee4bb5b377f5f8f9d9ee46.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/ab64ea1d8d134ba0845fb75e63a9a861.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/4841bf16bdb5469999b7c01b77c90325.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/14d1ed8474e5414591bc74e45bf0538a.png" />
- 假如电子运动速度与光速可以比拟，则当电子的动能等于它静止能量的2倍时，其德布罗意波长约为（ ）m。（普朗克常量<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/486718e348354f0f8706f38073d30016.png" />，电子质量<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/c39decde0930485fa409cb257f712e8a.png" />） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/e466e61658db48fc816f486d40ae959f.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/3a2fcc4c50a7410e807e4af3c59dcbc8.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/92443a569df04dee9598ae64e6aa3df9.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/21ffd61b214045ceac00daae77f7855f.png" />
- 如图所示，一束动量为 P 的电子，通过缝宽为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/b0abb5c99dbc4bec8b8315039bfee3d1.png" />的狭缝，在距离狭缝为 R 处放置一荧光屏，屏上衍射图样中央最大的宽度 d 等于（ ）。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/8d94370bc8794b4ebf5f88e8d5bdcf62.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/948caf37e15f4ae1a42fda70c455dcfd.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/07209cdf04d3491b9f214624bc9c0557.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/aa4fab6fa3e74ce6bd96b3e71c40fc30.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/e9fa48b360124287b56d549819645da5.png" />
- 当神经冲动到达运动神经末梢时，可引起接头前膜的（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/c84b709b9e9c4bb9a8b1942e8b41ae50.png" />通道开放 B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/05aeaddccf334079bf6c1268f2f1d915.png" />通道关闭 C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/3ad0962367574426ab5c55be38263105.png" />通道开放 D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/eacb0047877a43c5b10d8610ef234529.png" />通道开放
- 下列化合物有旋光性的是( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/42754375451947b4a2097a204914e285.png" border="0" vspace="0" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/259cc0f9369441888e4306c19039152f.png" border="0" vspace="0" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/c6798f5eb7e14df7a79f40cdd7d2f42e.png" border="0" vspace="0" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/4275928f484d4bad94705297fe159cf0.png" border="0" vspace="0" />
内容
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不同波长的电磁波有不同的频率，频率、波长与速度三者之间的关系为（）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/12388a4e000a493c9677667f96baec4e.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/448fcf95330149c6a5b533d950b29aa7.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/e18955c04da348178fc47edf20da8a20.png"/>
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已知物体的主、俯视图，左视图正确的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/3930fea847ba4492944ddb365a59ad61.png" border="0" vspace="0" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/8c60c5d1b6634256b2ef9a91dac8488e.png" border="0" vspace="0" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/c0b01d9bd70846c0a833771f3e1329f0.png" border="0" vspace="0" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/f4f8a566f2de4d289c53bb491395d1fe.png" border="0" vspace="0" />
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图示结构C截面弯矩为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/4f75b4fba9ff4be1b04a5e100c86c65e.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/145877d7a442497f9fe1266fa394ba2e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/1b6f8295e7bc44b0b8a2bee20e062fc4.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/18776e34a7504dfcbe40fbdf73958b14.png" /> D: 0
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下列结论错误的是（ ） A: 有界数列必收敛 B: 收敛数列必有界 C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/89b95e21b5484b1eb47dcf978abe6f53.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/ee27693800bb4cd2ae76608436dea153.png" />
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肌梭的传入冲动增加时，产生的生理效应是（ ）。 A: 抑制支配同一肌肉的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/9ac56a95b41140bda4b92a06b142fcac.png" />运动神经元 B: 兴奋支配其他关节肌肉的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/326ccbcecf0b4f38ad797c17e9c8f328.png" />运动神经元 C: 抑制支配同一肌肉的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/6072dea4f924446ba57f2784c01aa7e6.png" />运动神经元 D: 兴奋支配同一肌肉的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201806/31ef0f2b379b4020ae79a7f05d738d54.png" />运动神经元