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【简答题】
键无极性则分子一定无极性，键有极性而分子不一定有极性，这主要看分子有无对称性。
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【简答题】阅读理解 I made a promise to myself on the way down to the vacation beach cottage.For two weeks I would try to be a loving husband and father.Totally loving.No ifs,ands or buts. The idea had come to me as...
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