Tungsten is a scarce strategic resource. After more than 100 years of mining, domestic consumption of Wolframite resources is relatively more. Currently, scheelite resources are mostly mined. To protect…
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carbide
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The incandescent lightbulb has been making homes safer and brighter for over 100 years. After centuries using fires, candles, oil lamps and gas, the invention of the incandescent lightbulb transformed…