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| коэффициент безопасности для максимально допустимых нагрузок | |||
| коэффициент безопасности по расчётной нагрузке | |||
| proof factor: 4 phrases in 4 subjects |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Pipelines | 1 |
| Technology | 1 |
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