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| 材料质量 | |||
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material quality : 34 phrases in 11 subjects |
| Aviation | 4 |
| Business | 1 |
| Ecology | 1 |
| Economy | 5 |
| Electric machinery | 1 |
| Management | 1 |
| Oil / petroleum | 1 |
| Piezoelectric crystals | 1 |
| Space | 1 |
| Technology | 17 |
| Textile industry | 1 |
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