В вашем браузере отключен JavaScript. Будет показана упрощенная версия сайта, в которой могут отсутствовать многие функции.

Материалы по тегу «membrane water purification»

444

More than 2 billion people on the planet do not have access to clean drinking water. From 5 to 8 million people a year die after consuming low-quality water and the number of those who fall ill amounts to half a billion

Alexander Burmistrov

Partners

Show all

Social networking

Recent

Lectures

Click to start watching video
789

What saints did the conquistadors pray to and why did they decide to conquer Mexico? What was the ethnic, regional, and age composition of the Conquista? 

Show all