X線膠片相對(duì)感度的計(jì)算,最簡(jiǎn)便的方法是產(chǎn)生密度1.0(Dmin+1.0)的膠片A的曝光量對(duì)數(shù)(lgEA)與膠片B曝光量對(duì)數(shù)(lgEB)之差的反對(duì)數(shù)值乘以100?,F(xiàn)有四種膠片A、B、C、D產(chǎn)生密度1.0所需曝光量的對(duì)數(shù)值分別為0.7、0.55、0.4、0.10(已知) 膠片D對(duì)膠片A的相對(duì)感度為()