软硬互层金刚石复合片钻头在地浸砂岩型铀矿中的研究及应用
연경호층금강석복합편찬두재지침사암형유광중적연구급응용
Study and Application of Diamond Composite Bit in Soft and Hard Interbedded Rock of Leachable Sandstone Type Uranium Deposit
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