單項(xiàng)選擇題

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.

A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure

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單項(xiàng)選擇題

The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.

A.hour
B.day
C.week
D.month

單項(xiàng)選擇題

On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）

A.Engine is hard to start
B.Engine misses
C.Surges at governed RPM
D.Coolant temperature is too low

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