A.3V,4Ω B.6V,3Ω, C.-3V,4Ω D.-6V,3Ω

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问题 A.3V,4ΩB.6V,3Ω,C.-3V,4ΩD.-6V,3Ω

选项 A.3V,4Ω
B.6V,3Ω,
C.-3V,4Ω
D.-6V,3Ω

答案 A

解析
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