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一.光球板试样来源:1.七四年三月轴承行业出国考察时从匈 牙利带回一小块已使用过的西德光球板,厚度仅23毫米,以下简称西德板(匈),见图
I. Ball plate sample source: 1.744 years bearing industry study abroad from Hungary brought back a small piece of used West Germany ball plate, the thickness of only 23 mm, hereinafter referred to as West Germany (Hungary ), See figure