问题
单项选择题
The firewall device is a（）system for connecting a computer network to other computer network．
A．hardware
B．software
C．security
D．I/O
答案
参考答案：C
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The firewall device is a（）system for connecting a computer network to other computer network．
A．hardware
B．software
C．security
D．I/O
参考答案：C