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.
改性后超稳Y型分子筛的晶体结构热稳定性增加，脉冲微反试验的正已烷裂解活性下降而烯烃选择性得到提高。
The thermal stability ofthe crystal structure of modified USY zeolite is increased, and n-hexane cracking activity ina pulse micro-reactor is decreased, while the olefin selectivity is increased.
主要介绍了由SG3525构成的双管正激型开关稳压电源的基本电路结构和工作原理。
The basic circuit configuration and operation principle of dual switch forward converter based on SG3525 are introduced.
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