(来学网)前牙烤瓷熔附金属全冠牙体预备切端间隙至少应为
  • A.
    (来学网)0.5~0.8mm
  • B.
    (来学网)1mm
  • C.
    (来学网)1~1.5mm
  • D.
    (来学网)2mm
  • E.
    (来学网)2.5mm