Pretti普雷蒂PREabbr.Petroleum Refining Engineer炼油工程师pre-planting soil fumigant播前土壤熏蒸剂pre-cancerous dyskeratosis癌前期角化不良pre -stack depth migration叠前深度偏移prefabricated language block预制语块pre - cast and fabrication预制拼装predetermined time-sharing预定的分时Preoperative ultrasonography术前超声pre- wanning reengiaecfing预警流程再造pre-emulsification process预乳化滴加工艺pre-hydrotreating reaction预加氢反应