问题
单项选择题
The two primary protocols on which the Internet is based are( ).
A．FTP FInd TMAP
B．TCP and IP
C．TCP and SMTP
D．TCP and HTTP
答案
参考答案：B
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The two primary protocols on which the Internet is based are( ).
A．FTP FInd TMAP
B．TCP and IP
C．TCP and SMTP
D．TCP and HTTP
参考答案：B