套管伸缩器及定位钢管桩在滨海浮船平台绳索取心钻进中的应用
투관신축기급정위강관장재빈해부선평태승색취심찬진중적응용
Application of Sleeve Expansion Joint and Positioning Steel Pipe Pile in Wire-line Core Drilling at Coastal Pontoon Platform
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