单项选择题
A lighted preferred-channel buoy may show a（）.
A.fixed red light
B.Morse (A) white light
C.composite group-flashing light
D.yellow light
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相关考题
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单项选择题
A light that has a light period shorter than its dark period is described as（）.
A.flashing
B.pulsating
C.occulting
D.alternating -
单项选择题
A light having characteristics which include color variations is defined as（）.
A.switching
B.alternating
C.oscillating
D.fluctuating -
单项选择题
A light characteristic of composite group flashing indicates that there is a(n)（）.
A.sharp turn in the channel
B.narrowing in the channel at that point
C.junction in the channel
D.obstruction that must be left to port
