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Mineralogi & ädelstenar
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Несмотря на то, что основы добывающей металлургии известны уже много веков, всегда есть возможность усовершенствовать существующие процессы. Так и в ферросплавном производстве …
It was a different time. In 1970, the hippie culture was still going strong, and young people were ready to take on the world. It was a time of getting back to the land, jumping in …
Apesar de os fundamentos envolvidos na metalurgia extractiva serem conhecidos h s culos, sempre houve espa o para melhorar os processos existentes. Isto n o diferente na produ …
Bien que les principes fondamentaux de la m tallurgie extractive soient connus depuis des si cles, il a toujours t possible d'am liorer les processus existants. Il en va de m me …
Anche se i fondamenti della metallurgia estrattiva sono noti da secoli, c' sempre stato spazio per migliorare i processi esistenti. Questo non diverso nella produzione di …
Auch wenn die Grundlagen der Metallgewinnung seit Jahrhunderten bekannt sind, gab es immer Raum f r Verbesserungen der bestehenden Verfahren. Das ist bei der Herstellung von …
"What constitutes a precious stone is the question which, at the onset, rises in the mind, and this question, simple as it seems, is one by no means easy to answer, since what may …