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【单选题】
—个电场的电场线分布如图甲所示.把一个空心导体引入到该电场后的电场线分布如图乙所示.在电场中有A、B、C、D四个点,下面说法正确的是( )A.
φ A = φ B
B.
φ B = φ C
C.
E A = E B
D.
E B = E C
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