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單項(xiàng)選擇題

Which of the following may take place if the clearance of the main bearings are excessive?（）

A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above

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單項(xiàng)選擇題

Which of the following may 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 six starting valves stuck
D.the turning gear disengaged

單項(xiàng)選擇題

Which of the following may cause that an engine doesnt run on starting air?（）

A.too low starting air pressure
B.main start valve closed
C.neither A nor B
D.A and B