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| quality certificate: 41 phrases in 15 subjects |
| Business | 4 |
| Chemistry | 1 |
| China | 1 |
| Commerce | 3 |
| Compressors | 1 |
| Drilling | 1 |
| Economy | 2 |
| Engineering geology | 1 |
| General | 1 |
| International trade | 3 |
| Quality control and standards | 2 |
| Shipbuilding | 2 |
| Technology | 12 |
| Textile industry | 6 |
| Wind Energy | 1 |
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