问题
单项选择题
A packet-switched network, files and E-mail messages are broken down into small pieces, called( ).
A．messages
B．pieces
C．packets
D．circuits
答案
参考答案：C
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A packet-switched network, files and E-mail messages are broken down into small pieces, called( ).
A．messages
B．pieces
C．packets
D．circuits
参考答案：C