题目内容

在上楼梯时，鼓励孩子的身体直立，最好的方法是（）。

A. 你站在他面前，让他看着你
B. 你站在他身后，鼓励他身体向后
C. 在楼梯上方放上他感兴趣的玩具
D. 在每一个台阶上都放上他感兴趣的玩具

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Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

A. bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed
B. bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed
C. the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine
D. two-stoke/cycle diesel engines require more complicated lubrication piping

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