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單項(xiàng)選擇題

Scavenging in a four-stroke/cycle diesel engine occurs during the （）.

A.last part of the exhaust stroke, and the first part of the intake stroke
B.last part of the intake stroke only
C.early part of the injection stroke only
D.early part of the power stroke

單項(xiàng)選擇題

The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.

A.fresh water expansion tank
B.sea water expansion tank
C.thermostatic expansion valve
D.jacket water cooler accumulator

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