题目内容

They spent three months ___ Europe.

A. tou r
B. touring
C. to touring
D. to tou r

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You would be inclined ___ put that team on new projects again and again.

A. in
B. to
C. from
D. o n

She ___ herself stoically in her time of grief.

A. conduct
B. conducted
C. conducted of
D. conducted from

Which of the following words has the opposite meaning from the others?

A. increase
B. reduce
C. lower
D. shorten

波长为546.1nm的平行光垂直地射在1mm宽的缝上,若将焦距为100cm的透镜紧贴于缝的后面,并使光焦距到屏上,则衍射图样的中央明纹中心到第一级暗纹中心距离多大？（）

A. 0.546nm
B. 0.623mm
C. 0.546mm
D. 0.245nm