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【简答题】
(CH3)2N—PF2分子有两个碱性原子，P和N。一个倾向与BH3中的B原子键合，另一个倾向与BF3中的B原子键合。请指出具体的键合碱性原子，并解释。
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反馈参考答案：
举一反三
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A.
required
B.
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C.
unnecesary
【简答题】投影分为两类: 和 。
【单选题】It's important for the figures ________ regularly. [ ]
A.
to be updated
B.
to have been updated
C.
to update
D.
to have updated
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