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【单选题】
有一电流表表头,量程IC =50μA,表头内电阻RC =1kΩ,要将该电流表表头改装为量程U =1V的电压表,应( )。A.
与表头串联一个19kΩ的电阻
B.
与表头并联一个19kΩ的电阻
C.
与表头串联一个99kΩ的电阻
D.
与表头并联一个99kΩ的电阻
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