您要查找的是不是：
- 跟踪微分器（T-D）tracking differentiator
- 跟踪微分器tracking differentiator
- 二阶跟踪微分器TDsecond-order tracking differentiator
- 跟踪微分器参数与输入输出信号幅值频率关系Relation equations among the parameters of tracking-differentiator and the amplitude and frequency of its input-output signals
- 器utensil
- 管理器manager
- 资源管理器explorer
- 微分differential coefficient
- 微分方程differential equation
- 伺服器server (computer)
- 断路器breaker
- 感应器inductor
- 清洁器cleaner
- 稳压器manostat
- 读卡器card reader
- 混频器mixer
- 接触器contactor (switch)
- 筛选器sizer
- 集线器hub (network)
- 逆变器inverter
