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單項(xiàng)選擇題

As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

A.electric
B.heat
C.mechanical
D.exhaust

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單項(xiàng)選擇題

An overspeed safety device is usually fitted to a generator engine for （） in the event of overspeed.

A.cutting power off the engine
B.increasing the fuel pump setting
C.braking the crankshaft
D.stabilizing the ship speed

單項(xiàng)選擇題

An interlock in the remote operating valve line stops the valve （） when the engine turning gear is engaged.

A.to open
B.opening
C.open
D.opened