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| четыре начала (天, 地, 人, 物); неизвестные члены уравнения; уравнения с несколькими неизвестными | |||
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四元 : 60 phrases in 8 subjects |
| Electronics | 1 |
| Environment | 1 |
| General | 22 |
| Mathematics | 21 |
| Physics | 1 |
| Silicate industry | 1 |
| Technology | 12 |
| Telecommunications | 1 |
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