热加工工具钢
hot working tool steel
high temperature tool steel
特种钢纤维混凝土
special steel fiber concrete
特种工程结构
special engineering structure
特种工程塑料
special engineering plastics
Super engineering plastics
high performance engineering plastics
High-performance engineering thermoplastics
special engineering plastic
特种工业用油料作物
special industrial oil crop
特种工艺
special technological process