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單項(xiàng)選擇題

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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單項(xiàng)選擇題

A light that has a light period shorter than its dark period is described as（）.

A.flashing
B.pulsating
C.occulting
D.alternating

單項(xiàng)選擇題

A light having characteristics which include color variations is defined as（）.

A.switching
B.alternating
C.oscillating
D.fluctuating