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.<br>A:the temperature<br>B:the rust<br>C:the pressure<br>D:the humidity

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.
A:the temperature
B:the rust
C:the pressure
D:the humidity

出自：海船船员证

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