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单词 θ212284
释义
society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground > method of connecting boring rods and bit (1)
jar1865

A method of connecting the bit and the rods or cable in an apparatus for drilling rocks by impact, by means of which at each up-stroke a jar of…

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更新时间:2026/6/3 22:16:39