题目内容

傅立叶变换红外光谱仪与色散型仪器不同采用单光束分光元件。( )

A. 对
B. 错

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傅立叶变换红外光谱仪没有色散元件,主要是由光源、迈克尔逊干涉仪、探测器和计算机等组成。( )

A. 对
B. 错

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

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