单选题Oil mist detectors are usually used on board to detect oil mist density within （）.Athe engine crankcaseBthe engine scavenge boxesCdrain tanksDfuel tanks
单选题
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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