單項選擇題

（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）

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

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單項選擇題

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

單項選擇題

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

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（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）

你可能感興趣的試題

In a diesel engine, when the fuel is injected into the cylinder,（）

One of the differences between a two-stroke engine and a four-stroke engine is,（）