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现在使用的家用电灯泡,为什么要做成梨形?原来,钨丝灯泡发光是由于电流通过钨丝产生3 000℃以上的高热而实现的。在这样高的温度下,钨丝必须隔绝空气,以避免氧化作用,因
Why do you use a household light bulb that is now made into a pear shape? Originally, tungsten light bulbs were made to emit light because of the high heat generated by tungsten filaments above 3 000 °C. At such high temperatures, tungsten must be isolated from air to avoid oxidation.