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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】Most of us are the only child in our family. We have no brothers or sisters. Our family mainly consists of our mom,our dad and us. We are growing up in a world differently from our parents’. And we wi...
【单选题】---Monitor? --- I’m not monitor of our class. I __ with the teacher until the monitor is elected.
A.
will just help
B.
am just to help
C.
am just helping
D.
have just helped
【单选题】The newly built cafe′， the walls of ________ are painted light green, is really a peaceful place for us, specially after hard work. [ ]
A.
that
B.
it
C.
what
D.
which
【简答题】monitor/vice-monitor
【简答题】按照伺服系统类型,可将数控机床的控制系统分为 ( ) 、 ( ) 和 ( ) 。
【简答题】按照伺服系统类型,可将数控机床的控制系统分为( )伺服系统、( )伺服系统和( )伺服系统。
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