题目内容

在两个原子之间只能形成一个δ键。

A. 对
B. 错

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以等性杂化轨道形成的分子,其空间构型一定对称

A. 对
B. 错

It is a safety requirement to ___ an access bridge over a motorway.

A. instruct
B. destruct
C. construct
D. counsel

I was going to pursue ___ as if my life depended on it.

A. normalcy
B. normal
C. normative
D. unnormal

He confidently___ that he is offering the best value in the market.

A. claimed
B. talks
C. proclaims
D. declare

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