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【单选题】
What does it mean when the Rf value of a molecule is 1?A.
The molecule has no affinity to the stationary phase.
B.
The molecule is more adsorbed onto stationary phase.
C.
The interaction between molecule and mobile phase is weaker
D.
None of the above.
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皮皮学刷刷变学霸
举一反三
【单选题】出境货物通关单的有效期，一般商品为( )天，植物和植物产品为类货物为( )天。
A.
30 14 7 13．30 21 14
B.
60 21 7
C.
60 21 14
【单选题】Which is the right description about hip joint?
A.
It is the biggest and most complex joint in human body.
B.
It belongs to the biaxial joint.
C.
Neck of femur is out of the articular capsule completely.
D.
Femoral head is easy to dislocate downwards.
E.
It is a synovial joint.
【单选题】出境货物通关单的有效期，一般商品为( )天，植物和植物产品为( )天，鲜活类 货物为( )天。
A.
30 14 7
B.
30 21 14
C.
60 21 7
D.
60 2l 14
【单选题】Which is the right description about hip joint?
A.
It is the biggest and most complex joint in human body.
B.
It belongs to the biaxial joint.
C.
Neck of femur is out of the articular capsule completely.
D.
Femoral head is easy to dislocate downwards.
E.
all of above
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