简要介绍了自限温型PTC（正温度系数）电热带的结构、工作原理及性能特点；
The construction, work principle and characteristics of the temperature limited PTC(positive temperature coefficient) heating cable are briefly presented.
通过与邻近地区的优势科、植物种的相似性系数的比较，讨论了浙江省境内中、北亚热带的分界线。
The demarcation line between North and Central Subtropics in Zhejiang is also discussed by analysing the similarity coefficient of species and the list of advantage family in the adjacent regions.
热带气压场随时间的变化与时间系数的变化相似性最大，不同模态的时间系数变化具有明显周期振荡现象。
The change of the tropical pressure field is most similar with that of the time coefficients, and the time coefficients of different modes present obvious characteristics of periodical oscillation.
热带气压场随时间的变化与时间系数的变化相似性最大，不同模态的时间系数变化具有明显周期振荡现象。
The change of the tropical pressure field is most similar with that of the time coefficients, and the time coefficients of different modes present obvious characteristics of periodical oscillation.
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