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电容器按 V(t) = V_0 \e^(-t/RC) 放电。对 V_0 = 12 V,s:(a) ;(b) V 时?
电容器按 V(t) = V_0 \e^(-t/RC) 放电。对 V_0 = 12 V,s:(a) ;(b) V 时?
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