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PPI(Producer Price Index) 生产者价格指数rnPPM(Product Portfolio Management) 产品文件管理rn(Parts Per Million) 百万分率rnPPP(Purchasing Power Parity) 购买力平价rn(Point-to-Point Protoco1) 点到点协议rnPPT(Parts Per Trillion) 兆分子一rn