二、 1. “The signal lamps are labelled with 24 V/2 W. What is the resistance value of the glowing filament?” 请您将这句话翻译成中文,并计算句中所求的数值。 2. 为什么在开启带灯丝的照明灯时,短时间内通过的电流比照明时的发热状态下要大?
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