单项选择题
What monitoring device best indicates the load being carried by a diesel engine?（）
A.Lube oil pressure gauge B.Jacket water temperature gauge C.Tachometer D.Exhaust pyrometer
单项选择题 What is the purpose of the intake/exhaust valves in a diesel engine? （）
单项选择题 What is the operating principal of a flash type evaporator?（）
单项选择题 What is the effect of heated intake air on a diesel engine? （）
