Tungsten irin (tungsten carbide) ni lẹsẹsẹ awọn ohun-ini ti o dara julọ gẹgẹbi lile lile, resistance resistance, agbara ti o dara ati lile, resistance ooru ati ipata, paapaa lile giga rẹ ati resistance resistance, paapaa ni iwọn otutu ti 500 ℃. O wa ni ipilẹ ko yipada,…
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