题目内容

传统礼仪要求人们的举止（）。

A. 站如松
B. 坐如钟
C. 行如风
D. 卧如弓

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The size of the exhaust valve opening is （）

A. most critical in a four-stroke cycle diesel engine
B. most critical in a two-stroke/cycle diesel engine
C. most critical in a four-stroke/cycle diesel engine if it is turbocharged
D. of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine

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