当代洁净煤技术进展
Present Situation of Clean Coal Technology
洁净室区性能
district cleaning properties
洁净室及相关受控环境
Cleanroom and associated controlled environments
洁净气体灭火系统
clean gas fire exting uishing system
clean gas fire extinguishing system
洁净能源新技术
cleaned energy new technology
空气洁净度等级
classifi cation of clean room