如图所示的电路中,电源内阻不可忽略,电键S闭合前灯泡A、B、C均已发光.当电键S闭合时,A、B、C三个灯泡的亮度变化情况是(灯都不会烧坏)( )A.A亮度不变,B变亮,C变暗B.A变暗,B变亮,
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![如图所示的电路中,电源内阻不可忽略,电键S闭合前灯泡A、B、C均已发光.当电键S闭合时,A、B、C三个灯泡的亮度变化情况是(灯都不会烧坏)( )A.A亮度不变,B变亮,C变暗B.A变暗,B变亮,](/uploads/image/z/1356271-7-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E7%94%B5%E8%B7%AF%E4%B8%AD%2C%E7%94%B5%E6%BA%90%E5%86%85%E9%98%BB%E4%B8%8D%E5%8F%AF%E5%BF%BD%E7%95%A5%2C%E7%94%B5%E9%94%AES%E9%97%AD%E5%90%88%E5%89%8D%E7%81%AF%E6%B3%A1A%E3%80%81B%E3%80%81C%E5%9D%87%E5%B7%B2%E5%8F%91%E5%85%89%EF%BC%8E%E5%BD%93%E7%94%B5%E9%94%AES%E9%97%AD%E5%90%88%E6%97%B6%2CA%E3%80%81B%E3%80%81C%E4%B8%89%E4%B8%AA%E7%81%AF%E6%B3%A1%E7%9A%84%E4%BA%AE%E5%BA%A6%E5%8F%98%E5%8C%96%E6%83%85%E5%86%B5%E6%98%AF%EF%BC%88%E7%81%AF%E9%83%BD%E4%B8%8D%E4%BC%9A%E7%83%A7%E5%9D%8F%EF%BC%89%EF%BC%88%E3%80%80%E3%80%80%EF%BC%89A%EF%BC%8EA%E4%BA%AE%E5%BA%A6%E4%B8%8D%E5%8F%98%2CB%E5%8F%98%E4%BA%AE%2CC%E5%8F%98%E6%9A%97B%EF%BC%8EA%E5%8F%98%E6%9A%97%2CB%E5%8F%98%E4%BA%AE%2C)
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