You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.
- Athe temperature
- Bthe rust
- Cthe pressure
- Dthe humidity
问题
You must take good care of the drainag
参考解析：
分类：船舶动力装置题库,海船船员考试题库
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