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用非开挖方式向钢管道内穿插薄壁聚乙烯内衬是目前可选择的恢复旧燃气管道使用功能的最好方法。
It is a best method selected possibly nowadays for recovery of function of an old gas pipeline to insert a thin-walled polyethylene lining into a steel pipeline by the way of non-excavation.
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