單項選擇題The navigational term set of current means（）.
A.velocity of current in knots
B.direction from which the current folws
C.estima ed current
D.direction toward which the current flows
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1.單項選擇題The port clearance for a ship should be granted（）the completion of loading or discharging in the port.
A.before
B.when
C.after
D.during
2.單項選擇題The port gang way caught on a（）on the wharf and was severely damaged.
A.bollard
B.bitt
C.stem
D.keel
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