As you approach mile 659.4 AHP，you see on the right descending bank a flashing green light. This light marks（）.<br>A:a lock that is open<br>B:a sunken barge<br>C:a dolphin，water intake and discharge<br>D:the end of a wharf

As you approach mile 659.4 AHP，you see on the right descending bank a flashing green light. This light marks（）.
A:a lock that is open
B:a sunken barge
C:a dolphin，water intake and discharge
D:the end of a wharf

出自：海船船员证

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