问题
单项选择题
A()is created by a pressure gradient or slope in the water level.
A.gradient current
B.density current
C.swift current
D.torrent current
答案
参考答案:A
A()is created by a pressure gradient or slope in the water level.
A.gradient current
B.density current
C.swift current
D.torrent current
参考答案:A