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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单项选择题

A.regulate the fuel supply
B.maintain a constant fuel viscosity at the fuel valves
C.maintain efficient cooling
D.alter the fuel density

单项选择题

A.pressure
B.temperature
C.volume
D.specific gravity

单项选择题

A."vacuum"
B."the excess of pressure above atmosphere"
C."figure on a gauge"
D.Any of the above