d.diopter 屈光度，折光度Dn.字母DD. rimosa Roxb.多裂黄檀d intangible assets土地和无形资产的净购买额D.rainage channel排水管道D.C. parameters直流参数d'Alembertprincipled-hydroxypyridine4-羟基吡啶d. c. signaling直流信号传输, 直流信令d'Alembert equationd-block element d区元素d.esign principle设计原则