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| Normlicht A (лампа накаливания с цветовой температурой излучения 2854 град. К); Normlicht A (лампа накаливания с цветовой температурой излучения 2854 градуса К) | |||
| стандартный источник А: 3 phrases in 1 subject |
| Optics branch of physics | 3 |
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