单项选择题
If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?（）
A.Pump only if the discharge is led to a shore tank or barge
B.Pump only during the hours of darkness
C.Pump only on the outgoing tide
D.Pump only as much as is necessary
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A.sufficient oxygen to sustain human life
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C.a toxic atmosphere in the compartment
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Fire prevention during welding or burning aboard any vessel should include （）.
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