单项选择题

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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单项选择题
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
单项选择题
Buoys which mark dredging areas are painted（）.

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