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| кольцо и шар (прибор для определения температуры размягчения битуминозных материалов); К и Ш | |||
| кольцо и шар (metoda oznaczania temperatury mięknienia) | |||
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pierścień i kula : 4 phrases in 4 subjects |
| Chemistry | 1 |
| Construction | 1 |
| Laboratory equipment | 1 |
| Technology | 1 |
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