Pregl普雷格尔(Fritz, 1869-1930, 奥地利化学家, 曾获1923年诺贝尔化学奖)PREabbr.Petroleum Refining Engineer炼油工程师preappointment slip预约券preamble breakpoint前同步(信号)断点prednisolone tablet强的松龙片Pre-carboniferous前石炭纪pre-rinse sprayer初洗喷嘴Premna rnicrophylla豆腐柴pre-curing degree预固化度premixed combustion预混燃烧preadaptation phase适应前阶段precession of orbit轨道进动,轨道旋进