A.17910 B.17900 C.17920 D.17930
A.物理層 B.數(shù)據(jù)鏈路層 C.網(wǎng)絡(luò)層 D.傳輸層
A.數(shù)據(jù)庫(kù)營(yíng)銷(xiāo) B.一對(duì)一營(yíng)銷(xiāo) C.綠色營(yíng)銷(xiāo) D.關(guān)系營(yíng)銷(xiāo)