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單項選擇題

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

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單項選擇題

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

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

單項選擇題

When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.

A.strength
B.dense
C.percentage
D.velocity