Based on statistics of fire in China in the past years, the characteristics of developing trend and periodical fluctuation are found in fire regularity in China.
分析中国火灾的历年统计数据，发现中国火灾发生规律同时具有增长趋势性和周期波动性特征。
Periodical is a continuous publication with fixed name, the continuous characteristics of periodical design just reveals its continuity in design procedure.
期刊是具有固定的名称的连续性的出版物，期刊设计的延续性特征正是其连续性在设计中的体现。
This paper analyses the characteristics of the periodical work of university libraries, and points out some suggestion about development and use of periodical resources under network environment.
分析了网络环境下高校图书馆期刊工作的特点，并对网络环境下期刊信息资源的开发与利用提出了建议。
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