Rapid response to traditional k

树是由n(n≥0)个结点组成的有限集合T。n=0的树称为空树；对n>0的树，有:(1)仅有一个特殊的结点称为根结点，根结点没有前驱结点；(2)当n>1时，除根结点外其余的结点分为m(m>0)个互不相交的有限集合T1,T2，…，Tm，其中每个集合Ti本身又是一棵结构和树类似的子树。 -Tree is n (n ≥ 0) consisting of nodes finite set T. n = 0 of the tree known as the empty tree for n> 0 of the tree, there is: (1) has only one special node called the root node, root node there is no precursor node (2) when n> 1 when, with the exception of root node except the node is divided into m (m> 0) a finite set of mutually exclusive cross-T1, T2, ..., Tm, one of each set Ti is itself a structure and are similar subtree tree .

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摘要:基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向，交频分复用 OFDM)是一种无线环境下的高速传输技术，它对高速列车控制信息传输中卞要受到的由于多 径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和 基本原理，然后在计算机上用M atlal〕对其性能进行了仿真，仿真中将OFDM与传统的单载波 调制方式―i1，交振幅调制( 1frQAM)对抗多径十扰的性能进行了比较，最后分析了一者的仿真结果. -Abstract: Based on the communication technology train operation control system (CBTC) is a railway signal direction for the development of cross-frequency division multiplexing OFDM) is a wireless environment of high-speed transmission technology, its high-speed train control information transmission Bian be subject to the Due to the spread of multi-path fast fading caused by the impact of a strong resistance to diseases. This paper first introduces the OFDM technology development and the basic principles, and then on the computer〕 M atlal use its performance simulation will OFDM with the traditional single-carrier modulation-i1, cross-amplitude modulation (1frQAM) against multi-path interference of the 10 properties were compared with a final analysis of

学生选课系统 关键词 选课 学生 数据库 查询-Student Course Selection System Keywords elective student database query

是关于太阳能MPPT 的大集合有光伏跟踪。mppt，-MPPT on a large collection of solar photovoltaic tracking there. mppt,

能模拟训练雷达的基本功能，提供雷达模拟训练的环境文章实用性较强。-Simulation training to the basic functions of radar, radar simulation training to provide an environment highly practical article.

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IIC规范中文协议,内容比较全,比较新,为你的系统设计提供参考-IIC standardize Chinese agreement, the entire contents of comparison, the relatively new system design for your reference

美国GE公司MIL-1553B的标准说明书。是目前最全面的介绍1553总线的技术书籍。-American GE company MIL-1553B standard specification. Is the most comprehensive introduction of technical books bus 1553.

基于H.264编码的嵌入式服务器的全面的设计实现方案-Based on H.264 encoded Embedded Server Design and Implementation of a comprehensive program