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1·What's the best way to descale these pipes?

给这些水管除垢的最好方法是什么？

2·By the requirement of the wagon wheel descale technics and manufacturing which is needed before detection, a new type automatic synchronizing deruster was developed to realize these functions.

根据铁路货车轮对除锈探伤的工艺和生产要求，研制了新型的同步除锈机。