Urban medium-voltage distribution network, one of the most important parts of power system, is expected to distribute electric energy to consumers with considerable security and reliability.

城市中压配电网是整个电力系统的重要组成部分，其功能是将电力安全、可靠地分配到用户。

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The design basis of the springs and hydraulic system is proposed, which can better distribute the load of the rubber wheel and steering wheel, and attain the purpose of safety and reliability.

提供了弹簧及液压系统的设计依据，从而可以更好的分配导向轮与胶轮的载荷，达到安全、可靠的目的。

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The emphases of this paper are to find methods for multicast key management, which is to generate, distribute and update keys and to solve the problem of scalability, robustness and reliability.

本文探讨的重点是组播密钥管理如何为组成员生成组密钥、分发组密钥和更新组密钥，以及由此产生的扩展性、健壮性和可靠性问题。

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