|
|
|
|
|
|
|
| Certificate of qualification of scientific and technological enterprise |
|
|
|
|
|
| Member of China Boiler Water Treatment Association |
|
|
|
|
| Member of Shanghai air conditioning cleaning industry association |
|
|
|
|
| Shanghai refrigeration air conditioning engineering installation and maintenance enterprise qualification certificate |
|
|
|
|
|
|
|
