A.舌系帶 B.舌下腺 C.下頜骨 D.硬腭 E.下頜下區(qū)軟組織
A.上頜竇 B.鼻腔 C.對(duì)側(cè)上頜竇壁 D.硬腭 E.上牙槽
A.1% B.3% C.6% D.10% E.20%