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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1.單項(xiàng)選擇題What would be prima facie evidence of unseaworthiness? ()

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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題What is the holding power ratio of an anchor? ()

A.Maximum mooring line tension divided by the anchor's weight in air
B.Anchor's weight in air divided by the maximum mooring line tension
C.Preloading tension divided by the anchor's weight in air
D.Operating tension divided by the anchor's weight in air

5.單項(xiàng)選擇題What is the function of wearing rings found on some centrifugal pumps? ()

A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the outlet side from the inlet side
D.Dampen the turbulent discharge flow