题目内容

During the War, the fundamental documents of the US,____________________, was drafted and issued in 1776.

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The event that triggered the War of Independence is ______.

The Last Norman Kings was ______.

碳原子只有两个未成对电子，故只能形成2个共价键。（）

A. 对
B. 错

共价键有方向性的原因是_____________________________________________________。