previa[医] 前置的(如胎盘)PREabbr.Petroleum Refining Engineer炼油工程师preimplantation tissue typing植入前组织配型pre-test probability scores临床评分Pre - Schwarzian derivative对数导数preclinical safety evaluation临床前安全性评价predetermined factor overhead[经] 预定制造费用pre-hospital emergency care院前急救preamble detection arithmetic报头检测算法pre-criminological thinking前犯罪学思想pre-incorporation agreement预先混合协议pre - reinforced supporting超前支护