(来学网)制作双曲纵簧常用的钢丝直径为
  • A.
    (来学网)0.3~0.4mm
  • B.
    (来学网)0.7~0.8mm
  • C.
    (来学网)1.0~1.2mm
  • D.
    (来学网)0.5~0.6mm
  • E.
    (来学网)0.9~1.0mm