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【单选题】
某样品在薄层色谱中,原点到溶剂前沿的距离为6.3cm,原点到斑点中心的距离为4.2cm,其Rf值为A.
0.67
B.
0.54
C.
0.80
D.
0.15
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举一反三
【单选题】MSN is a convenient, highly informal medium for conveying messages that ______ well to human needs.
A.
adheres
B.
reflects
C.
conforms
D.
satisfies
【单选题】Medium well means the degree of the ripeness is _________ percent.
A.
40
B.
50
C.
90
D.
70 or 80
【单选题】Medium well means the degree of the ripeness is _________ percent.
A.
70-80
B.
40
C.
30
D.
90
【简答题】有效操作扣车的前提条件是哪些？
【单选题】By no means true that all native speakers of English know their own language very well．
A.
is that
B.
that is
C.
is it
D.
it is
【简答题】A means B method C medium D measure
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