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一、引言我厂生产的小四轮拖拉机差速器盖,材质是QT42－10,毛坯重4．5kg,原浇冒口系统如图1所示。
I. Introduction I plant the small four-wheel tractor differential cover, the material is QT42-10, rough weight 4.5kg, the original sprinkler system shown in Figure 1.