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硬质钨钢合金球27.735/27.74/27.745/27.75/27.755mm扩孔挤孔钢球
S1C27745ZWFAC 无源晶振 27.745MHz ±20ppm 20pF HC-49S
YG6钨钢球硬质合金球27.73/27.735/27.74/27.745mm扩孔挤孔钢珠