If the engine does not start on air, it may be due to （）<br>A:low compression of the fuel pumps<br>B:incorrect timing of fuel pumps<br>C:the starting air valves stuck<br>D:air-locks in fuel oil pipeline

If the engine does not start on air, it may be due to （）
A:low compression of the fuel pumps
B:incorrect timing of fuel pumps
C:the starting air valves stuck
D:air-locks in fuel oil pipeline

出自：海船船员证

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