题目内容

在刚体运动过程中，若刚体内任一平面始终与某固定平面平行，则这种运动就是刚体的平面运动。

A. 正确
B. 错误

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Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）

A. Cooling the air to a temperature just above dew point
B. Heating the air to a point at which moisture will boil off ,then re-cooling it
Cooling the air to a point below dew point, then reheating it
D. Heating the air and then cooling it to a point below dew point

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