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單項(xiàng)選擇題

A spherical buoy may be（）.

A.numbered
B.lettered
C.green
D.red

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單項(xiàng)選擇題

A special purpose buoy shall be（）.

A.lighted with a white light
B.striped black and red
C.lighted with a red light
D.yellow

單項(xiàng)選擇題

A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）

A.Flashing
B.Morse A
C.Equal interval
D.Occulting