单选题A flashing red light displayed at a single lock means that the lock（）.Ais ready to use but vessels must stand clearBis ready to use and vessels may approachCcannot be made ready immediately and vessels shall stand clearDcannot be made ready immediately but vessels may approach
单选题
A flashing red light displayed at a single lock means that the lock（）.
A
is ready to use but vessels must stand clear
B
is ready to use and vessels may approach
C
cannot be made ready immediately and vessels shall stand clear
D
cannot be made ready immediately but vessels may approach
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