“doublehand drilling”的概念、定义、翻译、参考文献-科学参考

单词	doublehand drilling
释义	doublehand drilling [`dǝb·ǝl´hand `dril·iŋ] ^ENGINEERING A rock-drilling method performed by two men, one striking the rock with a long-handled sledge hammer while a second holds the drill and twists it between strokes. Also known as double jacking.
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