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最佳答案：it is enough that you stay silently with meit would be grateful if you stand sil
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最佳答案：解题思路：根据氧气的物理性质：溶解性、密度，及其化学性质：能支持燃烧回答问题．（1）用排水法收集两瓶氧气，是利用了氧气不易溶于水的性质；故答案为：氧气不易溶于水
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最佳答案：1、You don't need to know.2、Did you just realize that?3、So what?
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最佳答案：1.Do you know who have given out the leaflets at the shcool gate yesterday?2.Do
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最佳答案：judge