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电灯泡的灯丝是用金属钨制成的。通电后,灯丝发热,温度高达2500℃以上。金属钨在高温下升华,一部分金属钨的微粒便从
The filament of a light bulb is made of metal tungsten. After the power is turned on, the filament heats up and the temperature is as high as 2500°C or more. Tungsten metal sublimates at high temperatures. Part of the metal tungsten particles will be