grade A甲级graden.等级；年级；成绩；斜坡v.分级；评分；渐次变化Graded nurse administration护士分级管理grade periodicity technique渐变周期性技术graded approximate operator程度近似算子graded broken stone mixture级配碎石配合比Graded - index waveguides渐变折射率波导grade of copper concentrate铜精矿品位graded finite element meshes变密度有限元网格grade compensation for curve曲线上纵坡折减graded-junction transistor变速生长晶体管grade-separation structure立体交叉结构