(来学网)舌杆至少应离开前牙舌侧龈缘
  • A.
    (来学网)1~2mm
  • B.
    (来学网)3~4mm
  • C.
    (来学网)5~6mm
  • D.
    (来学网)7~8mm
  • E.
    (来学网)9~10mm
正确答案:
B