单项选择题
A.Inefficient scavenging；twice B.Inefficient scavenging；1~8 times C.Fewer strokes in a circle；twice D.Fewer strokes in a circle；1~8 times
In a diesel engine, when the fuel is injected into the ...
单项选择题In a diesel engine, when the fuel is injected into the cylinder,（）
A.the piston is just coming upward from the bottom dead center B.the piston has moved about one-fifth of the way up C.the piston has moved most of the way up and almost reached the TDC D.the piston has just past the TDC
One of the differences between a two-stroke engine and ...
单项选择题One of the differences between a two-stroke engine and a four-stroke engine is,（）
A.a two-stroke engine can’t work without cylinders B.a two-stroke engine can’t work without pistons C.a two-stroke engine can’t work without crankshafts D.a two-stroke engine can’t work without a blower
A.a two-stroke engine works without exhaust operation B.a two-stroke engine works without compression stroke C.a two-stroke engine works without expansion stroke D.a two-stroke engine works without suction operation
