单选题In a river subject to tidal currents,the best time to dock a ship without the assistance of tugs is().Aat high waterBwhen there is a following currentCat slack waterDat flood

单选题
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


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