8.在如图所示的电路中电源的电动势e和内阻r恒定闭合 开关s后灯泡能够�光经过一段时间后灯泡突然变亮则 出现这种现象的原因可能是 Template




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tomski8.在如图所示的电路中电源的电动势e和内阻r恒定闭合 开关s后灯泡能够�光经过一段时间后灯泡突然变亮则 出现这种现象的原因可能是 coloring