DIN EN 61689 E:2010 超声波 物理治疗系统 0.5 MHz 至 5 MHz 频率范围内的现场规范和测量方法 (IEC 87/447/CD:2010) 草案
Draft Document - Ultrasonics - Physiotherapy systems - Field specifications and methods of measurement in the frequency range 0.5 MHz to 5 MHz (IEC 87/447/CD:2010)