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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

單項(xiàng)選擇題

Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.

A.operated manually once an hour
B.operated until the engine has started
C.placed into operation only at maximum load
D.adjustable to meet lubrication requirements