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单选题
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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考题
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单选题The emergency bilge suction valve is typically used （）.A
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decrease speedB
increase speedC
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单选题Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?（）A
Cargo tank ballastB
Segregated ballastC
Engine room bilgesD
Cargo pump room bilges
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