A.1/2 B.1/3 C.1/4 D.1/5
A.40° B.45° C.50° D.55°
A.1 B.2 C.3 D.4
A.20%~30% B.30%~40% C.60%~70% D.50%~60%
A.10%~20% B.20%~30% C.40%~50% D.50%~60%