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步骤:若灯泡发光或电表有示数,则它一定是与电源连通的,将这一部分线路描画好,再分析是短路故障还是断路故障.
Step: If the light bulb is glowing or the meter has a number, it must be connected to the power supply. Draw a good picture of this part of the circuit and analyze whether it is a short circuit fault or an open circuit fault.