(来学网)圆锥形套筒冠内冠壁的厚度应为
  • A.
    (来学网)0.3mm
  • B.
    (来学网)0.5mm
  • C.
    (来学网)0.7mm
  • D.
    (来学网)1.0mm
  • E.
    (来学网)1.5mm
正确答案:
A