d.diopter 屈光度，折光度Dn.字母DD.C.offset circuit直流补偿电路d band crochet machine花边与带类钩编机dxc cimdp single caner单片彩色摄象机D-S effective theory证据理论d-norpseudoephedrine去甲麻黄碱, d-降假麻黄碱d'alembert's principleD - isoascorbic acid异VCd-trachelanthamidine[化] 毒豆碱D.C. noise of tape磁带直流噪声d-characrer factor d特性因子