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【单选题】
图示电路中,欲使 U 1 = U /4,则 R 1 和 R 2 的关系式为( )。A.
R 1 =2 R 2
B.
R 1 = R 2 /2
C.
R 1 = R 2 /3
D.
R 1 =3 R 2
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