PPTabbr.生产前试验；试制性试验(=Preproduction Test )PPTA fibre聚对苯二甲酰对苯二胺纤维PPTA-pulp芳纶浆粕PPTA fibers芳纶纤维PPT project旅游扶贫战略ppt.no.n.沉淀值pptical networks光网络Pptimality conditions最优性条件Pptical zone diameter光学区直径PPT to introduce the MHP.(译)：幻灯片介绍的MHP 。