chain drill
链钻
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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