单项选择题
（）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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相关考题
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单项选择题
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 -
单项选择题
（）, the repair in so short a time is unknown to us.
A.How they finished
B.How did they finished
C.That how they finished
D.That how did they finished -
单项选择题
Which of the following represents the maximum percent of oxygen by volume required to be achieved by a ship’s inert gas system, prior to the commencement of crude oil tank washing?（）
A.6%
B.8%
C.10%
D.12%
