(来学网)全色谱双绞通信电缆的芯线由纯电解铜制成,一般为软铜线。其部颁标称线径有()
  • A.
    (来学网)0.3mm
  • B.
    (来学网)0.4mm
  • C.
    (来学网)0.5mm
  • D.
    (来学网)0.6mm
  • E.
    (来学网)1.0mm