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本文介绍了50AT道岔钢轨的开发研制过程中孔型设计及试制情况。
The development process including the pass design and trial production of 50AT switch rail is introduced.
youdao
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本文介绍了50AT道岔钢轨的开发研制过程中孔型设计及试制情况。
The development process including the pass design and trial production of 50AT switch rail is introduced.
youdao