A light characteristic of composite group flashing indicates that there is a(n)（）.<br>A:sharp turn in the channel<br>B:narrowing in the channel at that point<br>C:junction in the channel<br>D:obstruction that must be left to port

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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