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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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更新时间:2025/3/20 6:17:50