题目内容

The () layer of the OSI model organizes bits from the physical layer into logical data units called frames.

A. physical
B. data-link
C. network
D. transport

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() is a protocol used for transferring files.

A. FTP
B. SMTP
C. TELNET
D. HTTP

() is a protocol that can access and transfer documents on the WWW.

A. FTP
B. SMTP
C. TELNET
D. HTTP

The transport layer protocol of TCP/IP is called ().

A. TCP
B. UDP
C. IP
D. a and b

2012年11月8日至14日,中国共产党第____全国代表大会在北京举行。( )

A. 十六次
B. 十七次
C. 十八次
D. 十九次

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