单项选择题
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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相关考题
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单项选择题
What would be prima facie evidence of unseaworthiness? （）
A.Overloading
B.Overstowage
C.Overbooking
D.Overcarriage -
单项选择题
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 -
单项选择题
What is the principle behind dynamic braking as used on an anchor windlass?（）
A.Electrical loading
B.Mechanical distribution
C.Compressibility of air
D.Mechanical friction
