题目内容

It has been rather costly to install the machinery, but it will prove to be worth the money ______

A. in conclusion
B. in the long run
C. in case
D. at the end

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The situation today is obviously quite different from ______ it was only 50 years ago.

A. which
B. what
C. when
D. such

79（）

A. healthy
B. expensive
C. clean
D. common

71（）

A. true
B. possible
C. clear
D. polite

大型UPS设备电池室，酸性和碱性蓄电池与采暖、散热器的净距不应( )。

A. 小于0.75m
B. 大于0.75m
C. 小于0.55m
D. 大于0.55m