At present, most of the impeller made of cast iron, cast steel and bronze made.

目前多数叶轮采用铸铁、铸钢和青铜制成。

youdao

At present, most of the impeller made of cast iron, cast steel and bronze made.

目前多数叶轮采用铸铁、铸钢和青铜制成。

youdao