题目内容

对于同一试样,在不同溶剂中,红外吸收强度有很大差别。( )

A. 对
B. 错

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She helped me ________ my things and then we went around to see the other girls.

A. unpack
B. unpacked
C. unpacking
D. unpacks

A pharmacist can fill any prescription if, in his or her judgment, the prescription is________ .

A. valid
B. invalid
C. validly
D. validity

Put _________ in the appropriate box if you would like further information about any of ourproducts.

A. a tick
B. tick
C. the tick
D. the ticks

We have to _______ our efforts to attract young players.

A. renew
B. renewed
C. renewing
D. to be renewed

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