第三条通信网络安全防护工作坚持积极防御、综合防范、分级保护的原则。
Article 3 the communication network security protection shall follow the principle of "active defense, comprehensive precaution and classified protection".
历史街区应采用整体保护、真实共存、分级保护、适度整治更新的保护原则。
The principles of Historic districts's protection, include integrated protection, sincerity coexist, hierarchical protection, and apposite update.
实验表明，系统对于分级保护的应用具有良好的适应性和可扩展性，并有效提高了扫描效率。
According to the experiment, the application of classification protection has good adaptability and scalability with the system, and it also approves the efficiency of scanning.
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