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某船的艉轴铜套在机械加工时发现铜套一端局部位置有零星缺陷(气孔、夹渣),有类似缺陷的铜套共有4个,下图为缺陷位置示意图。
A copper shaft sleeve in the machining found that one end of the copper sleeve has sporadic local defects (porosity, slag), a total of 4 similar defects in the copper sleeve, the following figure shows the location of defects.