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gcr15轴承钢珠39.71/39.72/41.2/41.21/41.22/41.23/41.24mm钢珠
U钻扩孔钻深孔钻2D39 2D39.2 2D39.3 2D39.4 2D39.5 2D39.72D39.8
硬质钨钢球合金球39.695/39.7/39.705/39.71/39.715/39.72mm钢珠
OSC 3225 复印机用 频率有源贴片晶振 39.72M 39.72MHZ 39.720MHZ
39.71 39.72 39.73 39.74 39.75 39.76 39.77 39.78 39.79塞/针规