PACXn.专用自动计算机交换机PACabbr.太平洋的(=Pacific)abbr.无人驾驶飞机(=Pilotless Aircraft)abbr.政治行动委员会(=political action committee)Pac-Man defense帕克曼式防御Pachyapppa pilosan.毛埃斯绵蚜pacing group size定步组大小Pachyacris vinosan.厚蝗Pachyseris rugosan.皱纹厚丝珊瑚pachysantermine A富贵草特明胺A, 富贵草酯碱pachynsis pleurae胸膜肥厚Pacinian solution帕西尼(氏)液:数红细胞用的一种稀释液Pachybeuron nawai松毛虫宽缘金小蜂Pachygnathateneran.柔弱粗螯蛛