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Drilling
containing
双心
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内外筒各自旋转的双筒取心筒
core barrel of double tube swivel type
内外筒相对固定的双筒取心筒
core barrel of double tube rigid type
内筒不随外筒旋转的双筒取心筒
double-tube core barrel, swivel type
内筒随外筒旋转的双筒取心筒
double-tube core barrel, rigid type
双筒取心钻井
double core barrel drill
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