单项选择题

A mid-channel buoy，if lighted，will show a（）.

A.fixed red light
B.Morse (A) white light
C.green light
D.flashing red light

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单项选择题

A.gnomonic curve
B.small circle
C.meridian
D.great circle

单项选择题

A.relative bearing
B.range line
C.track line
D.estimated position

单项选择题

A.painted color
B.light color and phase characteristic
C.type of structure
D.All of the above