单选题During check on top clearance in main bearings, turn the crankthrow for the relevant cylinder unit to （） and stop the lube oil circulating pump.Aport sideBstarboard sideCBDC positionDDC position
单选题
During check on top clearance in main bearings, turn the crankthrow for the relevant cylinder unit to （） and stop the lube oil circulating pump.
A
port side
B
starboard side
C
BDC position
D
DC position
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