單項(xiàng)選擇題() are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.

A.Doors
B.Aspirate gauzer
C.Coupling
D.Blind


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3.單項(xiàng)選擇題“Stand by an engine” means ()

A.“prepare to stop the engine”
B. “assemble an engine on its bedplate”
C. “make an engine ready for starting”
D. “dismantle an engine”

4.單項(xiàng)選擇題“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner ()

A.by using of fresh water
B.with compressed air
C.by using of sea water
D.with chemical compound