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
参考答案:C
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
参考答案:C