利用中国大陆1970年以来记录相对完备的294次5.0级以上的地震序列，研究地震序列类型的空间分布特征。
Based on 294 earthquake sequences with magnitude greater than or equal to 5.0 occurred in Chinese mainland since 1970, the spatial distribution features of sequence types have been studied.
引入序列可膨胀空间的概念，给出了它的一些性质，并且证明完备映射保持序列可膨胀性。
We introduce the concept of sequentially expandable Spaces, explain some their characteristics and show that perfect mappings preserve sequentially expandable Spaces.
引入序列可膨胀空间的概念，给出了它的一些性质，并且证明完备映射保持序列可膨胀性。
We introduce the concept of sequentially expandable Spaces, explain some their characteristics and show that perfect mappings preserve sequentially expandable Spaces.
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