阿摩線上測驗
19. ___________ means a tidal current that flows continually with the direction of flow changing through all points of the compass during the tidal period.
(A) Continuous current
(B) Reversing current
(C) Cycling current
(D) Rotary current
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統計： A(1), B(0), C(0), D(0), E(0) #4054252
統計： A(1), B(0), C(0), D(0), E(0) #4054252
