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5.單項選擇題當(dāng)一臺計算機從FTP服務(wù)器下載文件時,在該FTP服務(wù)器上對數(shù)據(jù)進行封裝的五個轉(zhuǎn)換步驟是()

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B.數(shù)據(jù),數(shù)據(jù)段,數(shù)據(jù)包,數(shù)據(jù)幀,比特
C.數(shù)據(jù)包,數(shù)據(jù)段,數(shù)據(jù),比特,數(shù)據(jù)幀
D.數(shù)據(jù)段,數(shù)據(jù)包,數(shù)據(jù)幀,比特,數(shù)據(jù)