单项选择题
A.crankcase B.low lube oil temperature C.excessive oil consumption D.low bearing oil pressure
Differential needle valves used in fuel injectors are d...
单项选择题Differential needle valves used in fuel injectors are directly closed by（）
A.cam action B.spring force C.fuel oil pressure D.firing pressure
In a closed cooling water system, which of the problems...
单项选择题In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A.An open vent in the cooling system B.A fouled sea chest C.A restricted water passage in the engine D.Air entrained in the cooling water
Proper dispersion of fuel in a diesel engine cylinder i...
单项选择题Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）
A.injection pressure B.shape of combustion space C.turbulence in combustion space D.all of the above
