daisy chain 菊链daisy-wheel printer 菊轮式打印机dam bar 挡板damp 阻尼damp, over 过阻尼damp, under 欠阻尼damped filter 阻尼滤波器damped oscillation 阻尼振荡damped vibration 阻尼振动damping factor 阻尼因素damping of galvanometer 电流计阻尼damping, coefficient of 阻尼系数dark current 暗电流dark fiber 深色光纤, 暗色光纤dark line spectrum 暗线光谱dark-trace screen 暗迹屏幕data abstraction 数据抽象度data access arrangement (DAA) 数据存取编排data acquisition 数据采集data acquisition board 数据采集板data acquisition system 数据采集系统data address generator (DAG) 数据位置产生器da