(来学网)弯制口外弓的内弓用
  • A.
    (来学网)0.9~1.0mm钢丝
  • B.
    (来学网)1.0~1.2mm钢丝
  • C.
    (来学网)1.2~1.4mm钢丝
  • D.
    (来学网)1.4~1.6mm钢丝
  • E.
    (来学网)1.4mm以下均可