(来学网)铸造前腭杆前缘距离余留牙牙龈缘的距离
  • A.
    (来学网)≥3mm
  • B.
    (来学网)≥4mm
  • C.
    (来学网)≥5mm
  • D.
    (来学网)≥6mm
  • E.
    (来学网)≥7mm