2. 计算机
  3. The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing sy

The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing sy

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问题 The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing system for protecting the secret information.
A．web pages
B．modem
C．security
D．Network
选项 A、 
B、 
C、 
D、 
答案C
解析
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