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【单选题】
在最简单的硼氢化物 B 2 H 6 中,连接两个 B 之间的化学键是:
A.
氢键;
B.
氢桥;
C.
共价键;
D.
配位键。
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A.
正确
B.
错误
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【单选题】I _____ a precious book in a used-book store. It became an important source of reference for my thesis.
A.
take turns
B.
reached out to
C.
disposed of
D.
stumbled upon
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【单选题】(Be sure) to rut out the light (before) you (leave). Yes. I'll (put out it).
A.
Be sure
B.
before
C.
leave
D.
put out it
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A.
正确
B.
错误
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A.
gain
B.
profit
C.
bargain
D.
win
【单选题】最早通过机械方式产生真空成功尝试的学者是:
A.
帕斯卡
B.
托里拆利
C.
巴本
D.
格里克
【判断题】色彩的亮度是只有在绝对纯粹、没有混杂物的情况下才是完全饱和的。
A.
正确
B.
错误
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