短語詞組短語vertical mean flow 平均流vertical -flow drier 直流式烘干機vertical pipeline flow 垂直管流vertical upward flow 垂直上升管vertical subsurface flow 垂直潛流Vertical upward flow channel 垂直向上流動通道vertical conduit flow 垂直管流vertical downward flow 垂直下降流vertical current flow method 直角通電法 返回 vertical flow