A.1/4~1/2 B.1/3~1/2 C.1/2~2/3 D.1/2~1
A.四點(diǎn)法 B.五點(diǎn)法 C.六點(diǎn)法 D.九點(diǎn)法
A.100% B.98% C.95% D.90%