在公式 1 R = 1 r 1 + 1 r 2 中,(r 1 +r 2 ≠0),用r 1 、r 2 表示R是( )
A.
R=r 1 +r 2
B.
R=r 1 r 2
C.
1 R = r 1 + r 2 r 1 r 2
D.
R= r 1 r 2 r 1 +r 2
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