PACl聚合铝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)pachymeningioma[医] 硬脑[脊]膜瘤Pachia pastoris毕赤酵母Pachystermine A粉蕊黄杨环氮碱A, 富草酰胺碱APachycephalinaen.厚头啸鹪亚科Pachygnathagaoin.高氏粗螯蛛；新种pachysantermine富贵草酯碱, 粉蕊黄杨内酯碱pacing catheter起搏导管Pachylasmatidaen.厚板藤壶科pacing strategy节奏策略Pachon's method