A.<1500gB.<2500gC.<2000g
A.≤0.8;≤1.0B.≤0.6;≤0.8C.≤0.8;≤0.6
A.1.0(對(duì)數(shù)視力表5.0)B.1.2(對(duì)數(shù)視力表5.1)