单项选择题
Oil mist detectors are usually used on board to detect oil mist density within （）.
A.the engine crankcase
B.the engine scavenge boxes
C.drain tanks
D.fuel tanks
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A.regulate the fuel supply
B.maintain a constant fuel viscosity at the fuel valves
C.maintain efficient cooling
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A.pressure
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单项选择题
"gauge pressure" means（）.
A."vacuum"
B."the excess of pressure above atmosphere"
C."figure on a gauge"
D.Any of the above
