Describe some questions of the national standard modification statement of steel for cold heading and cold extruding.

简述了冷镦和冷挤压用钢国家标准修订说明中的一点儿问题。

youdao

Describe some questions of the national standard modification statement of steel for cold heading and cold extruding.

简述了冷镦和冷挤压用钢国家标准修订说明中的一点儿问题。

youdao