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單項選擇題

Which of the following can be directly obtained by means of an indicator card?（）

A.power
B.maximum pressure in a cylinder
C.mean pressure in a cylinder
D.all of the above

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單項選擇題
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
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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