问题描述：
[单选]
Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of（）．
A．fuel oil vapor at the sludge tank vent
B．unburned fuel vapors in the scavenge air receiver
C．lube oil vapors in the crank case
D．lube oil vapors in the engine room
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答案解析：无
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