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| атомность; атомный номер; порядковый номер; атомное число | |||
| порядковый номер атома; числа-близнецы Менделеева | |||
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原子序数 : 12 phrases in 4 subjects |
| Chemistry | 5 |
| Electronics | 2 |
| General | 3 |
| Technology | 2 |
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