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Oil / petroleum
containing
岩 心 钻
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Chinese
English
岩心钻
头
hollow bit
岩心钻
进进尺
cored foot age
研磨式
岩心钻
进
abrasive core drilling
金刚石
岩心钻
头
diamond core bit
金刚石钻取岩心
diamond drill core
顿钻取岩心
percussion core
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