(来学网)制作双曲舌簧时常选用钢丝直径为
  • A.
    (来学网)0.2~0.3mm
  • B.
    (来学网)0.4~0.6mm
  • C.
    (来学网)0.9~1.0mm
  • D.
    (来学网)0.7~0.8mm
  • E.
    (来学网)2.0~2.5mm