关于《机车牵引用渗碳淬硬齿轮金相检验》标准修订的探讨
관우《궤차견인용삼탄쉬경치륜금상검험》표준수정적탐토
A discussion on the revision of the Standard - " Metallographic Inspection of Carburized Traction Gears for Locomotive"
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