單項(xiàng)選擇題When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.
A.discharging
B.recircling
C.loading
D.taking in
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A.Overloading
B.Overstowage
C.Overbooking
D.Overcarriage
2.單項(xiàng)選擇題What is the purpose of pressure-vacuum relief valves? （）
A.Regulation of discharge pressure from cargo pumps
B.Maintaining constant velocity in cargo lines
C.Regulation of suction head on cargo pumps
D.To maintain a tank or void at atmospheric pressure
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