问题
单项选择题
Firewall is a （ ） mechanism used by organizations to protect their LANs from the Internet.
A．reliable
B．stable
C．peaceful
D．security
答案
参考答案：D
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Firewall is a （ ） mechanism used by organizations to protect their LANs from the Internet.
A．reliable
B．stable
C．peaceful
D．security
参考答案：D