Определение валентности химических элементов в соединении
мини-урок для самостоятельного изучения или закрепления темы
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11 months ago 00:07:45 1
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9 months ago 00:15:27 20
3 years ago 00:03:09 20
4 years ago 00:05:30 27
3 years ago 00:08:24 74
9 years ago 00:18:53 1K
13 years ago 00:03:12 38
1 year ago 00:10:03 1
3 years ago 00:48:26 13
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3 years ago 00:03:48 2
2 years ago 00:03:41 1
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5 years ago 00:08:44 9
2 years ago 00:13:02 4
