NOTES:1.THREADS TO BE ROLLED.2.material: dia tellurium copper ca per eng spec half hard
问题描述:
NOTES:1.THREADS TO BE ROLLED.2.material: dia tellurium copper ca per eng spec half hard
答
提示:1线要绕起来 2 材料 金刚石 碲 铜 钙
后面看不懂