swp一l3是什么材料？

SWC: S-STEEL; W-WIRE; C-CORBON即碳素弹簧钢丝，为JIS标准；SWP: S-STEEL; W-WIRE; P-PIANO即琴钢丝,为JIS标准,分三个等级，分别为SWPA,SWPB,SWPV

匿名回答于2023-10-09 10:43:31