Приёмы обращения с лабораторным оборудованием. Наблюдение за горящей свечой...
Полный сборник уроков по Химии (8 класс):
6 days ago 00:08:26 3
2 months ago 00:00:29 11
2 months ago 00:05:30 1
4 months ago 01:15:17 1
4 months ago 00:37:19 1
4 months ago 00:54:19 1
4 months ago 00:00:44 14
4 months ago 00:21:04 1
4 months ago 00:00:40 1
4 months ago 02:50:54 1
4 months ago 00:01:00 1
4 months ago 01:24:07 1
4 months ago 00:06:22 1
4 months ago 00:01:43 1
4 months ago 00:03:14 1
4 months ago 00:01:09 1
4 months ago 00:55:12 1
4 months ago 00:06:22 1
4 months ago 01:45:51 1
4 months ago 01:07:35 2
4 months ago 00:12:43 1
4 months ago 01:05:24 1
4 months ago 00:17:57 1
4 months ago 00:00:43 1
