单选题（）is not a physical wall, but a lot of virtual data to protect the computer network.AData wallBData ChannelCData baseDfirewall
单选题
（）is not a physical wall, but a lot of virtual data to protect the computer network.
A
Data wall
B
Data Channel
C
Data base
D
firewall
参考解析
解析：
中文：防火墙不是一个实际的墙，它是利用一些虚拟的数据来保护电脑。
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