单选题
The emergency bilge suction valve is typically used （）.
发布日期：2021-03-22
to inject cleaning additives when the bilges are extremely dirty
when the main condenser becomes fouled, in order to provide additional cooling water circulation
to connect the rose box to the independent bilge suction
if the bilges become flooded and they can not be emptied by any other means
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An independent bilge suction is required for （）.
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