A.<5s B.10s C.15s D.20s E.25s
A.0%~20% B.20%~40% C.40%~60% D.60%~80% E.80%~100%
A.Bekesy自描測聽 B.電反應測聽 C.音叉試驗 D.純音測聽 E.言語測聽