单项选择题
A.Hard alloy steel construction B.Beveled edges on the valve head C.Low alloy steel construction D.Poppet type design
A diesel engine cylinder head can crack as a result of ...
单项选择题A diesel engine cylinder head can crack as a result of （）
A.a leaking seal ring B.heat transfer from exhaust valves C.restricted cooling passages D.overheated intake valves
In large, low-speed, main propulsion diesel engine, pos...
单项选择题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A.top of the ring groove B.back of the ring groove C.bottom of the ring groove D.piston ring end clearance
Diesel engine blow-by is the leakage of combustion gase...
单项选择题Diesel engine blow-by is the leakage of combustion gases past the （）
A.oil rings only B.compression and scraper rings C.cylinder liner sealings D.cylinder liner ring grooves
