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| "西格马" (Sigma, 载人航天飞船(美)) | |||
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| 西格玛 (буква греческого алфавита, Σ, σ); 西格马 (буква греческого алфавита Σσ) | |||
| Russian thesaurus | |||
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| греческая буква ?, ?. В математике символ ? часто употребляют для обозначения суммы. Большой Энциклопедический словарь | |||
| Сигма: 30 phrases in 6 subjects |
| Economy | 2 |
| General | 21 |
| Japan | 1 |
| Mathematics | 1 |
| Military | 1 |
| Technology | 4 |
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