Accurate evaluation of QoS of GSM-R network is particularly important. Testing method of QoS of GSM-R is explored when GSM-R carries train control service.是什么意思_Accurate evaluation of QoS of GSM-R network is particularly important. Testing method of QoS of GSM-R is explored when GSM-R carries train control service.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句