单选题For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.Aa gravity tankBa sumpCa vesselDa bottle
单选题
For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.
A
a gravity tank
B
a sump
C
a vessel
D
a bottle
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