The oil mist detectors continuously（） the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.<br>A:detract<br>B:extract<br>C:pump up<br>D:pump down

The oil mist detectors continuously（） the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.
A:detract
B:extract
C:pump up
D:pump down

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