单选题When operating the air supply system in a covered lifeboat the（）.Afuel supply valve should be closedBhatches，doors，and oar ports should be closedCair cylinder shut-off valve should be closedDengine should be shut off
单选题
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
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