北京石油化工工程公司环保所
Beijing Petrochemical Engineering Company EPI
大庆石油化工工程公司
daqing petrochemical engineering co
高分子化工工艺
high polymerized chemical techmological chain
广东工业大学轻工化工学院
Faculty of Light Industry and Chemical Engineering
Guangdong University of Technology
化工工人
Chemical plant workers
trace element
Employees of chemical factory
Chemical industry workers
化工工序合并
chemical industrial stages combination
化工化纤工艺管道
chemical industry and chemical fiber pipeline
洛阳石油化工工程公司
LPEC
Luoyang Petrochemical Engineering CO
能源重化工工业园
energy and heavy chemical industrial Park
石油化工工程
petrochemical project
petrochemical engineering
石油化工工程建设项目
petrochemical engineering construction project
石油化工工程设计
petrochemical plant design
双原料化工艺
double raw materials process