單項(xiàng)選擇題Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during ().

A.the power stroke
B.the compression stroke
C.low load operation only
D.periods of standby


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1.單項(xiàng)選擇題The speed of the camshaft in a two-stroke/cycle diesel engine, running at 950 RPM, is ().

A.475 RPM
B.950 RPM
C.1900 RPM
D.2400 RPM

2.單項(xiàng)選擇題In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the ().

A.suction pressure regulator
B.thermostatic bypass valve
C.sea water temperature
D.water level in the expansion tank