Then the paper proposes the idea of "technical assurance on the quenching quality of rail" and deals with its execution method.
如何保证钢轨淬火质量，是一个十分重要的问题。
Then the paper proposes the idea of "technical assurance on the quenching quality of rail" and deals with its execution method.
如何保证钢轨淬火质量，是一个十分重要的问题。
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