A.40% B.25% C.28.4% D.91.2% E.82%
A.3~5歲 B.6~7歲 C.8~9歲 D.11~13歲 E.18歲以后
A.安氏Ⅰ類牙列擁擠 B.安氏Ⅰ類上頜前突 C.安氏Ⅱ類Ⅰ分類 D.安氏Ⅲ類 E.開(kāi)