单项选择题

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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单项选择题

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

单项选择题

A relative bearing is always measured from（）.

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

单项选择题

A preferred-channel buoy will show a（）.

A.white light whose characteristic is Morse (A)
B.group-occulting white light
C.composite group-flashing (2 + 1) white light
D.composite group-flashing (2 + 1) red or green light