019.Кремний.
“Леннаучфильм“. автор сценария Савченкова Л.. режиссер Захаров Ю.1979 г.
Показывает распространение кремния в природе, получение свободного кремния...
7 months ago 05:04:21 1
10 months ago 00:02:05 1
1 year ago 02:12:01 1
3 years ago 00:00:09 1
3 years ago 00:15:21 4
3 years ago 00:00:11 3
3 years ago 00:00:11 1
3 years ago 00:00:08 1
4 years ago 00:00:11 2
4 years ago 00:00:09 1
4 years ago 00:00:10 1
4 years ago 00:00:09 1
4 years ago 00:00:10 1
4 years ago 00:00:09 1
5 years ago 00:00:09 1
5 years ago 00:00:15 1
5 years ago 00:10:04 1
6 years ago 00:18:52 24
