單項(xiàng)選擇題

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

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單項(xiàng)選擇題

A propeller, in order to operate efficiently, must rotate at a relatively （） speed.

A.high
B.low
C.fast
D.lowly

單項(xiàng)選擇題

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