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Advances in Civil Engineering
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2024
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Article
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Fig 13
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Research Article
Research on Hydraulic Fracturing Technology of Long Boreholes along Strata of High Vast Thick Coal Seam
Figure 13
Combined bit (PDC): (a)
Φ
94 mm tire PDC bit and (b)
Φ
193 mm reaming drill bit.
(a)
(b)