介绍了双级单熔池炼钢新工艺。
The article presents new steelmaking technology of two stage and single bath.
双级压缩复叠式热泵系统的最突出特点就是中冷器。
The most important part of the system of TCCH is intercooler.
已成为信用等级、资信等级双aaa级企业。
Has become a credit rating, the credit grade of double AAA grade enterprise.
深圳地区的双一级膜结构企业（膜结构设计一级、膜结构施工一级）；
The double level of membrane structure companies in shenzhen area .
深圳地区的双一级膜结构企业（膜结构设计一级、膜结构施工一级）；
The double level of membrane structure companies in shenzhen area .
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