pptpartpertrillion1兆分之…..ASTPPTPAmerican Society for the Preservation of Professional Tax Professionals 美国税务职业者职业存档协会PPTCpolymerpositivetempe..PPTDpancreas-preservingt..PPTNprecipitation降水;降雨;沉..PPTPPreproduction Test Procedure 生产前试验的程序PPTSPalestinePilgrimsTex..PPTYproperty 财产，所有物PPTPPPromulgators of Public Toilets in Public Parks 公园中的公厕宣传者STPPTPSociety to Protect Professional Tax People 保护专业纳税人协会ASPPTAssociation for Suppliers of Printing and Publishing Technologies 印刷和出版技术供应者协会IPPTA艾普塔PPTPreproductionTest生产前..Pptprepared 制备的，配制的pptdprecipitated 沉淀的apptitude不称职