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| 材料质量 | |||
| 商品质量; 商品质地; 材料质地 | |||
| 原材料质量 | |||
| quality of material: 5 phrases in 4 subjects |
| Ecology | 1 |
| Economy | 2 |
| Piezoelectric crystals | 1 |
| Technology | 1 |
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