pretaxadj.纳税前所得的PREabbr.Petroleum Refining Engineer炼油工程师Pre-Selected Manual Control预选手册控制pre-stressed concrete beams预应力混凝土梁Precambrian metamorphic rocks前寒武系变质岩precast hollow concrete block预制空心混凝土块preexisting wild-type tumor预成野生型肿瘤pre - scientific conception前科学概念pre-Qin dynasty archaeology先秦考古pre-finishing tooth profile前加工齿形Preboot Execution Environmentn.预引导执行环境precancerous fibroepithelioma癌前期纤维上皮瘤