提出了一套剂量限制系统 : 正当化(justification) 最适化(optimization of protection) 个人剂量限值(individual dose limitation) 3. 考虑社会与经济因素，使辐射曝露合理抑低。
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optimization of radiation protection 辐射防护的最优化 ; 辐射防护最优化 ; 最优化
The author emphasizes that optimization of protection is a forward-looking iterative process aimed at preventing exposures before they occur.
强调了辐射防护最优化过程是不断进行的循环过程。
And its optimization must be done with integration of computer and communication technology as well as equipment of MAN and relay protection.
计算机技术、通信技术以及与城网一次设备、继电保护的合理集成是网络优化的保证。
This dissertation holds the objective of land sustainable use in the process of urbanization mainly focused on two aspects: farmland protection and structure optimization.
结合城市化进程的特殊研究背景，本文认为城市化进程中土地持续利用的研究目标主要有两个方面：农地保护与结构优化。
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