The development of the shell for the petroleum drilling machine is one of the developing projects in our company.

石油潜孔钻壳体的研制是我公司新产品开发项目之一。

youdao

The development of the shell for the petroleum drilling machine is one of the developing projects in our company.

石油潜孔钻壳体的研制是我公司新产品开发项目之一。

youdao