Oil mist detectors are usually used on board to detect oil mist density within （）.<br>A:the engine crankcase<br>B:the engine scavenge boxes<br>C:drain tanks<br>D:fuel tanks

Oil mist detectors are usually used on board to detect oil mist density within （）.
A:the engine crankcase
B:the engine scavenge boxes
C:drain tanks
D:fuel tanks

出自：海船船员证

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