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 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
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相关考题
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单项选择题
In a diesel engine,（） works as working medium and changes the heat energy to mechanical energy, changes the reciprocating movement to rotary moment（）
A.fuel spray； the burning of the fuel
B.the burned gas mixture； connecting rod
C.medium shaft；crankshaft
D.the burned gas mixture； piston rod -
单项选择题
In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）
A.the burning of the fuel； medium shaft
B.fuel spray； fresh air
C.fuel； fuel spray
D.the burning of the fuel； the burned gas mixture -
单项选择题
A propeller, in order to operate efficiently, must rotate at a relatively （） speed.
A.high
B.low
C.fast
D.lowly
