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【单选题】
某闭合电路中，电源的电压为定值，电流I（A）与电阻R（ ）成反比例。如图表示的是该电路中电流I与电阻R之间关系的图象，则用电阻R表示电流I的函数解析式为 [ ]A.
B.
C.
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A.
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B.
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C.
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D.
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