英语词汇“doublehand drilling”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	doublehand drilling
释义	doublehand drilling doublehand drilling [′dəb·əl‚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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