Which of the following may cause that an engine doesnt turn on starting air?（）<br>A:too low starting air pressure<br>B:main starting valve closed<br>C:neither A nor B<br>D:A and B

Which of the following may cause that an engine doesnt turn on starting air?（）
A:too low starting air pressure
B:main starting valve closed
C:neither A nor B
D:A and B

出自：海船船员证

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