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| ground state level | |||
| datum level; datum surface; index plane (по которому строится геологический разрез); reference plane | |||
| basic level | |||
| niveau surface | |||
| base level | |||
| index plane | |||
| ground level | |||
| ground level (колебательный); ground vibrational level (колебательный) | |||
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| ground level | |||
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| ground energy level | |||
| основной уровень: 80 phrases in 30 subjects |