单项选择题
A.Flashing B.Morse A C.Equal interval D.Occulting
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH O...
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
A rock and sand structure extending from the bank of th...
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
A relative bearing is always measured from（）.A.true nor...
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
