Air line lubricators are used in compressed air systems to lubricate （）.<br>A:the suction and discharge valves<br>B:tools and equipment served by compressed air<br>C:air line reducing valves<br>D:all of the above

Air line lubricators are used in compressed air systems to lubricate （）.
A:the suction and discharge valves
B:tools and equipment served by compressed air
C:air line reducing valves
D:all of the above

出自：海船船员证

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