本文首先研究了同步的分类以及各种同步理论。
This paper studies the simultaneous classification and various synchronization theory.
论述了各种同步误差的来源，分析了引入各种同步误差后对回波相位的影响；
The sources of variant synchronization errors are discussed, the analysis of echo phase effected by variant errors is given.
根据主存数据库的数据分布情况，设计了数据库数据的各种同步传输协议，实现了维护模块的设计。
All kinds of synchronization transport protocols were designed in the light of the data distributing of the MMDB system, realized the function of database maintenance module.
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