如图dgjc0029所示,三个电路的等效电阻关系为(____)。图<img alt="/upload/photos/20190626/7d85dacb156e423e9a72e3bc8bad6a99.png" src="/upload/photos/20190626/7d85dacb156e423e9a72e3bc8bad6a99.png" />
A.三个都相等 B.图b和图c的等效电阻相等,且和a不等 C.图c的等效电阻最小 D.图c的等效电阻最大正确答案A
如图dgjc0029所示,三个电路的等效电阻关系为(____)。图<img alt="/upload/photos/20190626/7d85dacb156e423e9a72e3bc8bad6a99.png" src="/upload/photos/20190626/7d85dacb156e423e9a72e3bc8bad6a99.png" />
A.三个都相等 B.图b和图c的等效电阻相等,且和a不等 C.图c的等效电阻最小 D.图c的等效电阻最大正确答案A