单选题A light characteristic of composite group flashing indicates that there is a(n)（）.Asharp turn in the channelBnarrowing in the channel at that pointCjunction in the channelDobstruction that must be left to port
单选题
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
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