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【单选题】
两组分物系的相对挥发度越小，则表示分离该物系越A.
容易
B.
困难
C.
完全
D.
不完全
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A.
The economy will stay unaffected by the high oil price.
B.
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C.
The oil price will surely drop by the end of the year.
D.
The oil price will keep on rising in the rest of the year.
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