题目内容

If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably _____.

A. misalignment or worn main bearings
B. insufficient cylinder lubrication
C. defective or poorly fitted valves
D. All of the above

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In the sentence“I can also vouch that the blues，like all music，is a universal language”(Pal agraph 3)，the word“Vouch”means________．

A. appreciate
B. promise
C. testify
D. gossip

中山服不能作为我国国家公务员的礼服之用。()

现代化的管理实践从来不赞成当面批评这种手段，因为这只会产生反作用，引起愤恨和不满，而不会有好的结果。()

待人接物时与人交往要把握分寸，即不能太冷淡，也不宜热情过度。()