The paper introduced PTA production process and its technology progress. It also analyzed current situation of PTA production, market and future development at home and abroad.

介绍了PTA（精对苯二甲酸）的生产工艺和技术进展，分析了国内外PTA的市场供需，并预测了消费的发展趋势。

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The source of PT acid in PTA, the crystal principle of PT acid and PTA, the variable factors cooling speed and solvent ratio in the crystal process were analysed.

分析了PTA中PT酸的来源，PT酸与PTA结晶过程的结晶原理，结晶过的可变因素冷却速度和溶剂比。

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The properties of purified terephthalic acid(PTA)waste mud in the process of PTA sewage tank were intro- duced briefly.

简要介绍了精对苯二甲酸（PTA）生产过程中，外排至污水厂活性污泥处理池中形成的污泥废料的性状。

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This Northwest Cluster event was sponsored by Great Seneca Creek Elementary School PTA, Matsunaga Elementary School PTA, Kingsview Middle School PTA and Roberto Clemente Middle School PTA. The PTAs in the Northwest Cluster of Montgomery County Public Schools are also looking to pilot a curriculum on bullying prevention through the Arts and Humanities Council of Montgomery County.

WHITEHOUSE: Susan burkinshaw | The White House

You're not expected to spend as much at the PTA auction in a public school.

FORBES: Public Choice

"It essentially suggests that they successfully infiltrated neighbourhoods, cocktail parties and the PTA, " Mr Krupp said.

BBC: US judge grants one Russian spy suspect bail