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| 单〔统〕一砂型 | |||
| 统一砂; 标准砂 | |||
| unit sand: 11 phrases in 5 subjects |
| Geology | 3 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 3 |
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