单项选择题
A.piston rings B.valve guides C.valve seals D.all of the above
In an operating diesel engine, pre-ignition can be caus...
单项选择题In an operating diesel engine, pre-ignition can be caused by （）
A.excessively late fuel injection B.oil in the air charge C.water in the fuel D.injection continuing after the fuel charge is ignited
One cause of diesel engine surging can be a result of （...
单项选择题One cause of diesel engine surging can be a result of （）
A.injection pump plungers stuck or worn B.low compression C.solenoid stuck open D.fuel tank too full
Cooling water pumps driven by direct reversing diesel e...
单项选择题Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）
A.facilitate bi-directional operation B.provide the greatest pump efficiency C.prevent pump clogging from marine growth D.prevent cavitation at the pump outlet
