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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

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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

單項(xiàng)選擇題

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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