图4-2 RFID阅读器16.02244REIRPRGPSTXTXSAPeTagTageGA42RGTEIRPSAPageTag42244REIRPRGPSPTXTXBack42)4(RGPSTXTXBackRXwGA42432)4(RGGPASPRXTXTXwBackRX图4-6 声表面波标签。