单项选择题
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
A.Flashing
B.Morse A
C.Equal interval
D.Occulting
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A.Entrance buoy
B.New buoy
C.Port buoy
D.Cardinal buoy -
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A.wingdam
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A relative bearing is always measured from（）.
A.true north
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C.the vessel's beam
D.the vessel's head
