单选题The velocity of the current in large coastal harbors is（）.Apredicted in Tidal Current TablesBunpredictableCgenerally constantDgenerally too weak to be of concern
单选题
The velocity of the current in large coastal harbors is（）.
A
predicted in Tidal Current Tables
B
unpredictable
C
generally constant
D
generally too weak to be of concern
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