An alternating light（）.<br>A:shows a light with varying lengths of the lighted period<br>B:shows a light that changes color<br>C:marks an alternate lesser-used channel<br>D:is used as a replacement for another light

An alternating light（）.
A:shows a light with varying lengths of the lighted period
B:shows a light that changes color
C:marks an alternate lesser-used channel
D:is used as a replacement for another light

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