The oil mist detectors continuously() the
问题:
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
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