干电池是�们实验时经常使用的电源它除了有稳定的电压外本身也具有一定的电阻实际使用时可以把干电池看成一个理想的电源和一个电阻串联组成 Template




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tomski干电池是�们实验时经常使用的电源它除了有稳定的电压外本身也具有一定的电阻实际使用时可以把干电池看成一个理想的电源和一个电阻串联组成 coloring