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【单选题】
一点电荷在电场中某点所受的电场力为零, 则该点A.
场强一定为零 , 电势一定为零
B.
场强不一定为零 , 电势一定为零
C.
场强一定为零 , 电势不一定为零
D.
场强不一定为零 , 电势不一定为零
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A.
like
B.
as
C.
for
D.
with
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