Tungsten, molybdenum, tantalum le niobium ke lisebelisoa tsa bohlokoa bakeng sa liindasteri tsa lifofane le ts'ireletso ka lebaka la thepa ea tsona: botsitso ba mocheso o phahameng, letsoalo le matla a ho tsitsa, matla a bona a macha le ts'ireletso ea mahlaseli.
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