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кольцевая структура | |||
кольцевидная структура | |||
циклическая структура |
环结构 : 23 phrases in 11 subjects |
Antennas and waveguides | 1 |
Business | 1 |
Chemistry | 1 |
Electronics | 2 |
General | 5 |
Geology | 2 |
Medical | 1 |
Oil / petroleum | 2 |
Oil processing plants | 1 |
Technology | 6 |
United Nations | 1 |