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【单选题】
均匀带电球面，半径为 R，电荷量为 q 。以无穷远处为电势0点，则到球心距离为 r 处的电势为（提示：可先根据高斯定理算出场强分布，再依据电势和场强的关系计算电势）
A.
r r>R;
B.
0                       r r>R;
C.
r 0                      r>R;
D.
r r>R;
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