图示电路为一已充电到 u C = 8V 的电容器对电阻 R 放电的电路,当电阻分别为 1k W , 6k W , 3k W 和 4k W 时得到 4 条 u C ( t ) 曲线如图 2 所示,其中对 3k W 电阻放电的 u C ( t ) 曲线是 ( ) 。
A.
a
B.
c
C.
b
D.
d
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