2. 计算机
  3. A ______ system placed between the company network and the outside world may limit outside access to the internal network.

A ______ system placed between the company network and the outside world may limit outside access to the internal network.

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问题 A ______ system placed between the company network and the outside world may limit outside access to the internal network.
选项 A、firewall
B、modem
C、gateway
D、key
答案A
解析 译文的含义是：(  )系统在公司网络和外部世界之间，可以限制外界访问内部网络。选项A～D的含义分别是防火墙、调制解调器、网关和密钥。
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