单选题The oil mist detectors continuously（） the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.AdetractBextractCpump upDpump down
单选题
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
参考解析
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