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【单选题】
关于色谱法下列说法正确的是A.
色谱过程是一个差速迁移的过程
B.
分离极性强的组分用极性强的吸附剂
C.
各组分之间分配系数相差越小，越易分离
D.
纸色谱中滤纸作固定相
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举一反三
【简答题】In his book, Churchill describes that ______ ( history ) first meeting with Roosevelt.
【简答题】宋代瓷的五大名窑是指( )、()、()、()、()。
【单选题】Churchill describes as "unfortunate" people who ________________.
A.
work extremely hard
B.
have many worries
C.
travel along a hopeful path
D.
have alomost everything they want
【简答题】history A. The film doesn't try to be _____ accurate, but it is based loosely on real s and people. B. In his book, Churchill describes that _____ first meeting with Roosevelt.
【简答题】Winston Churchill was one of the great men of his age. To show their respect for him, the British lawmakers asked a fine artist, Graham Sutherland, to paint Winston Churchill's picture. When it was co...
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