摘 要: | 883153新一代钻头证明是成功的 New Generation bf Drill Bits Proves Successful—Drilling Contractor,Vol.43, №.3,April/May 1987,P.30(英) 883154井下泵驱动系统的自动化 Automation in Downhole Pump Drive Svstems—World Pumps, Feb. 1987,P.42~45(英) 883155活塞泵中阀的运动 Valve Motion in Piston Pumps—World Pumps,March,1987,P.64~70(英) 883156变速离心泵的控制 Control on Variable-Speed Centrifugal
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