问题
单项选择题
| 7．A firewall is a (1) system designed to (2) an organization’s network against threats. |
(1)
A．operating
B．programming
C．security
D．service
答案
参考答案：C
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| 7．A firewall is a (1) system designed to (2) an organization’s network against threats. |
(1)
A．operating
B．programming
C．security
D．service
参考答案：C