灰铸铁，球墨铸铁，铸钢，阀体不锈钢。

Grey cast iron, nodular cast iron, cast steel, stainless steel.

youdao

灰铸铁，球墨铸铁，铸钢，不锈钢。

Grey cast iron, nodular iron, cast steel, stainless steel.

youdao

灰铸铁，球墨铸铁，铸钢，不锈钢。

Grey cast iron, nodular iron, cast steel, stainless steel.

youdao