Described are the welding technology and its technology evaluation inspection result of the semi-permanent couplers on multiple units.
介绍了动车组半永久车钩的焊接工艺及其工艺评定检测结果。
Described are the welding technology and its technology evaluation inspection result of the semi-permanent couplers on multiple units.
介绍了动车组半永久车钩的焊接工艺及其工艺评定检测结果。
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