Home / Standards / GB/T 20249-2006 GB/T 20249-2006 Active Acoustics - Definitions and measurement methods for the transmitted fields of focusing ultrasonic transducers 声学 聚焦超声换能器发射场特性的定义与测量方法 Standard Type GBT ICS 17.140 CCS C41 Status 现行 Issue Date 2006-05-08 Implementation 2006-11-01 Responsible Dept 中国科学院 Drafting Unit 中国科学院