参加鸡尾酒会的客人必须在请柬上注明的时间范围内准时出席,并要等到酒会结束才能退席。()
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公务员不准参加营业性歌厅、舞厅、夜总会等公共场所的开业庆典活动。()
当进入被接见方的房间时,应先将书包和其他的随身携带的物品放到桌子上再开口说话。()
在人际交往中,借助举止传递的信息占45%,借助语言传递的信息占55%。()
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