compound tube

• 复合管

compound tube的用法和样例：

例句

1. Double-ended pouring technology is used to compound high-chromium resistant cast iron in internal-wall of steel pipe with centrifugal casting.
   介绍了托轮式离心铸造机双头浇注技术在钢管内壁复合高铬耐磨铸铁复合管的生产工艺。