Which of the following may lead to the engine NOT to start on air?（）<br>A:starting air pressure too high<br>B:correct timing of starting air valves<br>C:three of the six starting valves stuck<br>D:the turning gear disengaged

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

出自：海船船员证

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