(来学网)一般加速器治疗床步进距离误差为
  • A.
    (来学网)2mm
  • B.
    (来学网)3mm
  • C.
    (来学网)4mm
  • D.
    (来学网)0.5mm
  • E.
    (来学网)0.1~0.2mm