What are cpa and ppa?

Certified Public Accountant (CPA) is the abbreviation of certified public accountant, which refers to the employees who have obtained the certificate of certified public accountant according to law and are entrusted to engage in auditing, accounting consulting and accounting services. In addition, cost per action, Cleaner Production Audit, Comprehensive Peace Agreement (Nairobi Comprehensive Peace Agreement) T and China Photographers Association are all referred to as CPA for short. Polyphthalamide (PPA) resin is a semi-aromatic polyamide with terephthalic acid or phthalic acid as raw materials. There are two kinds: semi-crystalline and amorphous, and their glass transition temperature is about 255 F. Amorphous PPA is mainly used in occasions where barrier properties are needed. Semi-crystalline PPA resin is mainly used in injection molding and other melting processes. Unless otherwise specified, the latter, semi-crystalline PPA resin, is mainly introduced below. Semi-crystalline PPAS has a melting point of about 590°F and is provided in the form of opaque rectangular slices.