单项选择题
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
A preferred-channel buoy will show a（）.A.white light wh...
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
A preferred-channel buoy may be（）.A.letteredB.spherical...
单项选择题A preferred-channel buoy may be（）.
A.lettered B.spherical C.showing a white light D.All of the above
