@xiafanzhao95
Активность: 3 года, 5 месяцев назад
What is tungsten?
Tungsten, meaning “heavy stone” in Swedish, is a very hard and heavy silver gray rare metal. With the highest melting point among metals, tungsten has a relatively large electric resistance as a metal, so it is used for heaters and reflectors in furnaces exceeding 2000℃.
It also becomes a hard alloy when mixed with carbo […] Просмотр