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【单选题】

In the following essay, each blank has four choices.Choose the most suitable one from the four choices and write down in the answer sheet.

A、 (66) is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running on separate computers at tached to the network.A、socket (67) two addresses: (68) . Sockets provide a (69) communication channel between one or more systems.
There are stream and datagram sockets separately using TCP and (70) .
A.is made of
B.composed of
C.is composed of
D.is consisted of
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根据网考网移动考试中心的统计,该试题:

12%的考友选择了A选项

21%的考友选择了B选项

52%的考友选择了C选项

15%的考友选择了D选项

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