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The prepositional phrase in "A chair is a piece .....
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环境有害因素导致机体反应的临界值A.是剂量-反应关系B.是"阈.....
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当地坑造型时,为使较高大的铸型便于烘干和排气顺畅,要在模.....
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Henry spares no effort to get two tickets for the concert held at the Sports Centre. _____..
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污染物在生物体内浓度减低一半所需要时间A.是剂量-反应关系B.....
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In the sentence "This beautiful village remains unknown to the rest of the world", the ita..
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