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通过对牛居至李官堡天然气长输管线阴极保护系统的重建过程的论述，表明采用外加电流阴极保护和牺牲阳极保护的联合保护方法是切实可行的。
Through the discussion of the reconstruction process of the cathodic protection system of Niuju-Ligebao natural gas long-distance pipeline, it is feasible to adopt the combined protection method of impressed current cathodic protection and sacrificial anode protection.