By far the greatest item of maintenance of the reciprocating air compressors concerns （）.<br>A:the lubrication<br>B:the cooling<br>C:the moisture separation<br>D:the valves

By far the greatest item of maintenance of the reciprocating air compressors concerns （）.
A:the lubrication
B:the cooling
C:the moisture separation
D:the valves

出自：海船船员证

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