Inner upsetting technology for thin wall drilling pipes was used in Series SQ high strength wire line drilling pipes.
研究开发成功的SQ系列高强度绳索取心钻杆首次采用了薄壁钻杆内镦粗技术。
Inner upsetting technology for thin wall drilling pipes was used in Series SQ high strength wire line drilling pipes.
研究开发成功的SQ系列高强度绳索取心钻杆首次采用了薄壁钻杆内镦粗技术。
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