When operating the air supply system in a covered lifeboat the（）.<br>A:fuel supply valve should be closed<br>B:hatches，doors，and oar ports should be closed<br>C:air cylinder shut-off valve should be closed<br>D:engine should be shut off

When operating the air supply system in a covered lifeboat the（）.
A:fuel supply valve should be closed
B:hatches，doors，and oar ports should be closed
C:air cylinder shut-off valve should be closed
D:engine should be shut off

出自：海船船员证

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