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三聚氰胺 甲醛树脂 : 14 phrases in 8 subjects |
| Chemistry | 2 |
| Ecology | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Plastics | 3 |
| Polymers | 2 |
| Technology | 2 |
| Textile industry | 2 |
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