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【单选题】
The young driver looked over the engine carefully lest it ______ on the way.A.
goes wrong
B.
would go wrong
C.
went wrong
D.
should go wrong
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有机溶剂萃取，分层性状不同
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【单选题】能快速区别皂苷和蛋白质水溶液的方法是（）
A.
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B.
有机溶剂萃取分层性状不同
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D.
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观察颜色不同
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