of balls 粒 数 千克 kg mm inch no.of balls no.of balls
par38 38的意思是 38/8 inches =4又1/2 inches 英寸=120mm 1
pcb线宽与电流关系
2 inch/50 mm sanding disc sanding paper hook and loop sandin
2inch 50mm sandpaper assortment 60-3000 grit sanding disc se
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