正确答案: D

the humidity

题目：You must take good care of the drainage cock of the air control system. Because lead scale formed which might malfunctions the pilot control valve and other instruments.

解析：D

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举一反三的答案和解析：

[单选题]柴油机下止点是指()

活塞离曲轴中心线的最近位置

[单选题]封闭式装货的特点是将岸罐的货物装到船舱内，货舱内的气体置换到()。

岸罐内