当前位置:在线题库搜索>[单选题]Which of the following may cause that an engine doesnt turn on starting air?()的答案是什么?

问题:

[单选题]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

参考答案: D

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