单选题If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.Amile boardBdredging markCpassing daymarkDcrossing daymark
单选题
If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.
A
mile board
B
dredging mark
C
passing daymark
D
crossing daymark
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