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【单选题】
如图 3 所示,三只完全相同的灯泡A 1 、A 2 、A 3 分别与电容器、电感线圈和电阻串联后接在同一交流电源 u i 上, 此时三只灯泡亮度相同, 当 供电 电源频率升高时A.
A 1 灯泡比原来亮 ， A 2 灯泡比原来 暗。
B.
A 1 灯泡比原来 暗， A 2 灯泡比原来亮 。
C.
A 3 灯泡比原来亮 ， A 1 、 A 2 亮 度不变。
D.
三只灯泡亮度 都不变。
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