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| двухполостный гиперболоид; двухполый гиперболоид | |||
| двуполостный гиперболоид; двухлопастный гиперболоид | |||
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双叶双曲面 : 12 phrases in 4 subjects |
| General | 5 |
| Mathematics | 2 |
| Oil processing plants | 2 |
| Technology | 3 |
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