安全机制不支持命令保护等级化。
Command protection level not supported by security mechanism.
介绍了国家的计算机信息系统安全等级保护。
This paper explores the hierarchy protection on the national computer information system.
论述了水源保护区高等级公路的设计方法。
This paper discusses the design methods of high-grade highway in water source protection area.
论述了水源保护区高等级公路的设计方法。
This paper discusses the design methods of high-grade highway in water source protection area.
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