（）continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.<br>A:The oil mist detectors<br>B:The smoke detectors<br>C:An oily water monitor<br>D:Oil discharge monitoring and controlling system

（）continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.
A:The oil mist detectors
B:The smoke detectors
C:An oily water monitor
D:Oil discharge monitoring and controlling system

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