prean甲基眠尔通PREabbr.Petroleum Refining Engineer炼油工程师pre-reading tasks阅读前期任务pre-design survey设计前期调查pre-group carrier前波群载波precessional motion旋进运动prefabricated parts预制构件predefined sequence[计] 预定义序列Prececal lymph node盲肠前淋巴结predication parsing预测分析法preepiglottic space会厌前间隙precontact position接触前位置