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| 闭环作用; 环化作用 | |||
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| 闭环作用; 循环闭合环化作用 | |||
| 循环闭合; 成环作用; 环化作用 | |||
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замыкание циклов : 3 phrases in 3 subjects |
| General | 1 |
| Nanotechnology | 1 |
| Oil processing plants | 1 |
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