非正常维护
Abnormal maintenance
以上为机器翻译结果，长、整句建议使用 人工翻译 。
就中开线春亭段输气管线在检修维护中发现的内层管道截面非正常变形问题进行了分析研究。
An analysis of abnormal deformation, which was found in the inner pipeline cross-section during the maintenance, was made on the Zhong-Kai gas transportation pipeline.
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