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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(驾驶专业) > 航海英语 > 航海学 > 航海学基本知识

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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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
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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
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