______are the periodic motion of the waters of the sea due to changes in the attractive forces of the moon and sun upon the rotating earth.(1.0)
A.Winds B.Tides C.Swells D.Currents正确答案B
______are the periodic motion of the waters of the sea due to changes in the attractive forces of the moon and sun upon the rotating earth.(1.0)
A.Winds B.Tides C.Swells D.Currents正确答案B