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5 - 9 классы

6. Определите валентность элементов по формулам: НgО, ZnO , NiO, BaO, PH3, SiH4...
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Дано:S=3×10^-16 м^2p=3×10^10ПаF-?​...
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13.02 Match photos 1–6 with six of the words in the box.Then listen and check.ca...
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