单项选择题
Diesel engine air start system check valves are opened by （）
A.an air start cam
B.cylinder compression pressure
C.starting air pressure
D.valve springs
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相关考题
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The cetane rating of diesel fuel is an indication of the （）
A.ignition quality of the fuel
B.calorific value of the fuel
C.flash point of the fuel
D.rate of fuel consumption -
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The condensers located in various stages of a flash evaporator are cooled by（）
A.distillate
B.seawater
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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A.Impeller
B.Compressor
C.After-cooler
D.Exhaust differ
