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Кислотные свойства в ряду высших оксидов бора-углерода-кремния 1) возрастают 2) ослабевают 3) сначала возрастают, затем ослабевают

ulozerova ulozerova    2   17.04.2019 07:40    7

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Мэрия777 Мэрия777  17.04.2019 07:40
3) сначала возрастают, затем ослабевают
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