问题
单项选择题
A firewall is a (68) system designed to (69) all organization, s network against threats.
A．operating
B．programming
C．security
D．service
答案
参考答案：C
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A firewall is a (68) system designed to (69) all organization, s network against threats.
A．operating
B．programming
C．security
D．service
参考答案：C