gravel bed filter

同义词释义

1)gravel bed filter,砾石滤床过滤器;砾石滤床滤池2)gravel bed filter,砾石滤床过滤器; 砾石滤床滤池3)gravel filter,砾石滤池4)gravel filter,砾石过滤器5)gravel screen,砾石滤器6)rapid graval filters,快砾石滤池