Ultrasonics - Physiotherapy systems - Field specifications and methods of measurement in the frequency range 20 kHz to 500 kHz (IEC 63009:2019); German version EN IEC 63009:2019
超声学.物理治疗系统.频率范围为20 kHz至500 kHz的现场规范和测量方法(IEC 63009-2019);德国版本EN IEC 63009:2019