GOST R 8.604-2004 国家测量统一性保证体系.医用诊断超声波设备.便携式胎儿心跳检测器.参数与测量方法描述的一般要求
State system for ensuring the uniformity of measurements. Medical diagnostic ultrasonic equipment. Portable foetal heartbeat detectors. General requirements for the declaration of parameters and measurement methods