A.語法B.語義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)
A.190.110.5.311 B.123,43,81,227 C.203.45.3.21 D.94.3.2