1)sand gravel filter,砂砾过滤机2)sand filter,砂砾过滤器3)sand and gravel filter,砂砾石过滤器4)rapid sand filter,快速砂砾过滤器5)gravel and sand filter bed,砂砾滤床6)machine-made gravel sand,机制砾砂
用法和例句
With the extensive using of the machine-made sand and shotcrete in engineering, the application of the machine-made gravel sand shotcrete is emphasized by constructor.
