2. 计算机
  3. (75)is a mechanism used for protecting the users outside of network from accessing some non-authorized computer resources.

(75)is a mechanism used for protecting the users outside of network from accessing some non-authorized computer resources.

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问题 (75)is a mechanism used for protecting the users outside of network from accessing some non-authorized computer resources.
选项 A、Router
B、Network Card
C、Firewall
D、protocol
答案C
解析 本题考查专业英语应用能力和防火墙的基本知识。参考译文：防火墙是阻止网络外面的用户存取非授权的计算机资源的一种机制。
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