A.腰4上緣 B.腰4 C.腰4下緣 D.腰5上緣 E.腰5下緣
A.1/4 B.1/3 C.1/2 D.2/3 E.3/4
A.3~4cm B.4~5cm C.5~6cm D.6~7cm E.7~8cm