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【单选题】
两个电阻并联计算它的总电阻是A.
.R 1 +R 2
B.
R 1 -R 2
C.
.(R 1 ×R 2 )/(R 1 +R 2 )
D.
(R 1 +R 2 )/(R 1 ×R 2 )
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