PPA

PPA

1. ■ =Parallel Processing Automata 并行处理自动机;

2. ■ Polymer Permeation Analyzer 聚合物渗透分析器;

3. ■ Polyphosphoric Acid 聚磷酸;

4. ■ Preliminary Pile Assembly 实验性反应堆;

5. ■ Produce Packaging Association 产品包装协会[美];

6. ■ Produce Packers' Association, Ltd 产品包装商协会[英];

7. ■ Publishers Publicity Association 出版商广告协会[美]