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如下图,敲击右侧的音叉,左边完全相同的音叉也会发声,说明左边的音叉也在_________,两个音叉之间的传声介质是_________。
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By 16:30, _____________ was almost closing time, nearly all the paintings had been sold.
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She looks sad. Could you please tell me that prevents her from being as happy as before? [ ]
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1年前
A.B两地相距630KM,甲乙两列火车从两地同时,已知甲相向而行,3小时相遇乙两地列车速比是4:3,求乙车速度
1年前