transducern.转换器；传感器transducer for operation手术用探头transducer dynamic draft换能器动态吃水transducer noise voltage换能器噪声电压transducer insertion loss变换器插入损耗transducer for aspiration吸取用探头transducer input impedance换能器输入阻抗transducer excitation unit转换器激励装置Transducer loading effects传感器附加质量transducer input admittance换能器输入导纳transducer voltage response换能器电压响应