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單項(xiàng)選擇題

A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.

A.Entrance buoy
B.New buoy
C.Port buoy
D.Cardinal buoy

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單項(xiàng)選擇題

A rock and sand structure extending from the bank of the river toward the channel is known as a（）.

A.wingdam
B.towhead
C.cutoff
D.landwall

單項(xiàng)選擇題

A relative bearing is always measured from（）.

A.true north
B.magnetic north
C.the vessel's beam
D.the vessel's head