如图所示,电源电压保持不变.R1和R2是顶值电阻,滑动边阻器的最大电阻值为R3.当滑片由一端向另一端移动时.电压表的示数在U/2至U/3之间变化.那么,如图:A.R1:R2=1:2B.R1:R2=1:1C.R2:R3=1:1D.R2、R3的功率
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![如图所示,电源电压保持不变.R1和R2是顶值电阻,滑动边阻器的最大电阻值为R3.当滑片由一端向另一端移动时.电压表的示数在U/2至U/3之间变化.那么,如图:A.R1:R2=1:2B.R1:R2=1:1C.R2:R3=1:1D.R2、R3的功率](/uploads/image/z/7596790-70-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%BF%9D%E6%8C%81%E4%B8%8D%E5%8F%98.R1%E5%92%8CR2%E6%98%AF%E9%A1%B6%E5%80%BC%E7%94%B5%E9%98%BB%2C%E6%BB%91%E5%8A%A8%E8%BE%B9%E9%98%BB%E5%99%A8%E7%9A%84%E6%9C%80%E5%A4%A7%E7%94%B5%E9%98%BB%E5%80%BC%E4%B8%BAR3.%E5%BD%93%E6%BB%91%E7%89%87%E7%94%B1%E4%B8%80%E7%AB%AF%E5%90%91%E5%8F%A6%E4%B8%80%E7%AB%AF%E7%A7%BB%E5%8A%A8%E6%97%B6.%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E5%9C%A8U%2F2%E8%87%B3U%2F3%E4%B9%8B%E9%97%B4%E5%8F%98%E5%8C%96.%E9%82%A3%E4%B9%88%2C%E5%A6%82%E5%9B%BE%3AA.R1%3AR2%3D1%3A2B.R1%3AR2%3D1%3A1C.R2%3AR3%3D1%3A1D.R2%E3%80%81R3%E7%9A%84%E5%8A%9F%E7%8E%87)
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