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偏心扩眼钻头
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偏心扩眼钻头
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eccentric reaming bit
偏心扩眼钻头
常规阶梯钻头的扩眼部分的旋转轴线偏离钻柱旋转轴线一定距离,假想存在一个以钻柱旋转轴线为中心线直径等于的圆柱,仅保留扩眼部分在假想圆柱内的刀翼,同时领眼部分和上部钻柱也必须落在假想圆柱内的结构限制的钻头。
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concrete with all of aggregates coming from tailings and waste rocks
concreting
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