And also the author introduces the characteristics and application benefits of the new chain-type percussion drilling, and analyzes the popularization and application prospect of the drill.

并介绍了新型链式冲击钻的特点及应用效益，进一步分析其推广应用的前景。

youdao

And also the author introduces the characteristics and application benefits of the new chain-type percussion drilling, and analyzes the popularization and application prospect of the drill.

并介绍了新型链式冲击钻的特点及应用效益，进一步分析其推广应用的前景。

youdao