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●A firewall is a (68) system designed to (69) all organization,s network aga－inst threats.

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●A firewall is a (68) system designed to (69) all organization,s network aga-inst threats.

(68) A．operating

B．programming

C．security

D．service

(69) A．prevent

B．protect

C．develop

D．exploit

参考答案:

C,B【解析】防火墙是一个安全系统，主要用于保护公司内部网络免遭攻击。

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