试题与答案

如图所示的电路,L1、L2和L3为三个相同的灯泡,灯泡电阻大于电源内阻,当变阻器

题型:多选题

题目:

如图所示的电路,L1、L2和L3为三个相同的灯泡,灯泡电阻大于电源内阻,当变阻器R的滑片P向左移动时,下列说法中正确的是(  )

A.L1、L3两灯变亮,L2灯变暗

B.L2灯中电流变化值小于L3灯中电流变化值

C.电源输出功率增大

D.电源的供电效率增大

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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A.Ⅰ期

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C.Ⅲ期

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题型:问答题

就甲、乙两家投标单位而言,若不考虑资金时间价值,判断并简要分析业主应优先选择哪家投标单位。
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