如何产生高效的量子信号，是量子密钥分配系统安全运行的关键。
The key to a sound QKD system is how to generate highly effective quantum signal.
电力系统无功功率优化是电力系统安全运行研究的一个重要组成部分。
Reactive power optimization in electric power system is important part for electric power safe run research.
访问控制是管理信息系统设计中的重要环节，是系统安全运行的有力保障。
Access control is an important part of the management information system design, a powerful guarantee for the safe operation.
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