In a river subject to tidal currents，the best time to dock a ship without the assistance of tugs is（）.<br>A:at high water<br>B:when there is a following current<br>C:at slack water<br>D:at flood

In a river subject to tidal currents，the best time to dock a ship without the assistance of tugs is（）.
A:at high water
B:when there is a following current
C:at slack water
D:at flood

出自：海船船员证

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