![](https://lstatic.shangxueba.com/jiandati/pc/images/pc_jdt_tittleico.png)
提问人:网友tinyripple
发布时间:2022-01-06
[主观题]
● The Internet is an open system, and most information is available to everyone. It is ver
y important to add (74) to existing system for protecting the secret information.
(74)
A. Web pages
B. modem
C. security
D. network
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_panel_vip.png)
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