单项选择题
An indication of a diesel engine air intake being partially clogged, is （）.
A.low firing pressure and low exhaust temperatures
B.low firing pressure and normal exhaust temperatures
C.high firing pressure and low exhaust temperatures
D.high firing pressure and high exhaust temperatures
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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 -
单项选择题
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
