Kub muag

Peb yog cov khoom lag luam zoo ntawm cov khoom siv raw thiab cov khoom ua tiav ntawm tungsten, molybdenum, tantalum, thiab niobium refractory cov ntaub ntawv. Peb cov khoom lag luam feem ntau suav nrog lub tshuab nqus tsev, cov cua kub kub, photovoltaic, semiconductors, thiab lwm yam lag luam. Peb zoo siab los pab cov neeg siv khoom daws teeb meem, thov hu rau peb tam sim.