单项选择题
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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相关考题
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单项选择题
When turning the engine with turning gear, you should keep the indicator cocks （）.
A.attached to the indicators
B.opened
C.closed
D.broken -
单项选择题
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 -
单项选择题
When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.
A.slightly acidic
B.slightly alkaline
C.no salty
D.slightly bitter
