短語詞組短語bdtr basic data transmission routine 基本數(shù)據(jù)傳輸例程basic transmission loss [電]基本傳輸損耗basic transmission unit [通信]基本傳輸單位BTU Basic Transmission Unit 基本傳輸單元bth basic transmission header 基本傳輸報(bào)頭free space basic transmission loss 自由空間基本傳輸損耗 返回 basic transmission