单词 | Michigan cut |
释义 | Michigan cut [`mich·ǝ·gǝn ¦kǝt] MINING ENGINEERING A technique used to break off ore at a heading; a large hole or series of small holes at the center of the heading are drilled parallel to the tunnel direction but not charged with explosive; other holes are drilled in the heading and charged so that upon detonation they break out toward the uncharged holes. |
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