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單項(xiàng)選擇題

Which factor of the following affects not only the fuels combustion but also the engine’s maintenance?（）

A.cetane number
B.flash point
C.viscosity
D.setting point

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單項(xiàng)選擇題

Which cause of the following can lead to the engine not to start on air?（）

A.starting air pressure too high
B.correct timing of starting air valves
C.three of the starting valves stuck
D.the turning gear disengaged

單項(xiàng)選擇題

When turning the engine with turning gear, you should keep the indicator cocks （）.

A.attached to the indicators
B.opened
C.closed
D.broken

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