A.5% B.15% C.25% D.50%
A.20~30cm B.0.5~1.0m C.1~1.5m D.1.5~2.0m
A.0.7或0.7以上 B.0.8或0.8以上 C.0.9或0.9以上 D.0.95或0.95以上