单项选择题
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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相关考题
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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 -
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
