单项选择题
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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The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.
A.hour
B.day
C.week
D.month -
单项选择题
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 -
单项选择题
The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
A.regulating the level of corrosion inhibitor in the primary cooling system
B.the level of the freshwater expansion tank
C.varying the engine load to meet temperature requirements
D.the operation of the thermostatic valve
