The paper analyzes the influencing factors and causes of computer network security, and studies the preventive measures of computer network security.

文中分析了影响计算机网络安全的诸多因素及其产生的原因，探讨了计算机网络安全的防范措施。

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Be responsible for the security and confidentiality of the hotel computer system. Take preventive measures to computer virus and kill virus regularly.

负责饭店电脑方面的安全及保密工作，做好各种病毒的预防和定期杀毒。

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In this paper, the computer network security problems are discussed thoroughly, and put forward the corresponding improvement and preventive measures.

该文对计算机网络安全存在的问题进行了深入探讨，并提出了对应的改进和防范措施。

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As circular as it sounds, rare events are rare primarily because they don't occur very often, and not because of any preventive security measures.

CNN: Stop the panic on air security

Examples of preventive conservation are: appropriate measures and actions for registration, storage, handling, packing and transportation, security, environmental management (light, humidity, pollution and pest control), emergency planning, education of staff, public awareness, legal compliance (source: ICOM-CC definition).

UNESCO: CULTURE