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
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相关考题
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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 -
单项选择题
Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）
A.To reduce the main engine speed
B.To increase the main engine speed
C.To govern the main engine speed
D.To fix the propeller shaft
