A.150.66.80.8B.190.55.7.5C.126.110.2.6D.160.33.88.55
A.語(yǔ)法B.語(yǔ)義C.異步D.同步
A.通信協(xié)議和網(wǎng)絡(luò)層次結(jié)構(gòu) B.數(shù)據(jù)傳輸速率和誤碼率 C.網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)和網(wǎng)絡(luò)傳輸介質(zhì) D.數(shù)據(jù)傳輸速率和數(shù)據(jù)交換技術(shù)