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【单选题】
下列说法正确的是()。A.
电位随着参考点（零电位点）的选取不同而变化
B.
电位差随着参考点的选取不同而变化
C.
电路上两点的电位很高，则其间电压也很大
D.
电路上两点的电位很低，则其间电压也很小
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