Second, with the advent of the Internet era, network information security has become a hidden danger.
第二，随着网络时代的全面到来，网络信息安全也日渐成了隐患。
This article mentioned the computer network from each level security hidden danger, and it has researched the safe design proposal in each level of computer network.
以两册有关场地安全设计的译著为基础，从场地调研、威胁分析、划分安全防范等级、制定场地安全对策四个方面介绍了美国场地安全设计体系的组成及工作流程。
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