题目内容

两电容器的电容之比为C1：C2=1：2。(1)把它们串联后接到电压一定的电源上充电，它们的电能之比是，(2)如果是并联充电，电能之比是

A. 2:1，2:1
B. 1:2，2:1
C. 2:1，1:2
D. 1:2,1:2

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