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虚拟局域网不可跨越交换机。()

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arp属于链路层。()

The lights went out and she had to______for her glasses on the bedside table in the darkness.

A. grope
B. search
C. look
D. seek

一个网卡可以绑定多个IP地址。()

过滤型防火墙很难防止数据驱动型的病毒攻击。()

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