A.1/3~1/4 B.1/2~1/5 C.1/5~1/6 D.1/4~1/5
A.2m2 B.4m2 C.5m2 D.8m2
A.直徑小于9mm B.直徑大于9.5mm C.直徑大于10mm D.直徑大于12mm