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單項(xiàng)選擇題

Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）

A.Flashing
B.Quick flashing
C.Composite group flashing
D.Equal interval (isophase)

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單項(xiàng)選擇題

Buoys which mark isolated dangers are painted with alternating（）.

A.red and black bands
B.green and black bands
C.red and white stripes
D.green and white bands

單項(xiàng)選擇題

Buoys which mark dredging areas are painted（）.

A.black
B.yellow
C.green
D.red

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