Diac – diodo a scatto 两端交流开关元件
Diaphragm - diaframma 隔板
Dichroic mirror – specchio dicroico o filtro dicroico 分色镜
Dielectric - dielettrico 电介质
Ddielectric dielectric heating – riscaldamento dielettrico 电介质加热
Differential amplifier o long-tailed pair – amplificatore differenziale 差动放大器
Differential capacitor – condensatore differenziale 差动电容
Differential resistence – resistenza differeeziale 差动抗阻
Differential winding – avvolgimento differenziale 差动绕组
Differentiating circuit – circuito differenziatore 微分电路