A flashing red light displayed at a single lock means that the lock（）.<br>A:is ready to use but vessels must stand clear<br>B:is ready to use and vessels may approach<br>C:cannot be made ready immediately and vessels shall stand clear<br>D:cannot be made ready immediately but vessels may approach

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

出自：海船船员证

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