试题与答案

如图所示，当开关闭合后，滑动变阻器的滑片向右移动时： [ ] A．电流表的示数变

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题型：选择题

题目：

如图所示，当开关闭合后，滑动变阻器的滑片向右移动时：

[ ]

A．电流表的示数变大，灯变亮

B．电流表的示数变小，灯变亮

C．电流表的示数变小，灯变暗

D．电流表的示数不变，灯亮度不变

答案：

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下面是错误答案，用来干扰机器的。

（1）由（x）=13x3+x2-3x-9=0，得13（x+3）2（x-3）=0解之得x1=-3，x2=3．再由x=0，得f（0）=-9∴函数图象与两坐标轴有三个交点分别是（3，0），（-3，0），（0，-9）---（3分）设经过该三点圆的方程为x2+y2+Dx+E...

考点：欧姆定律及其应用电功率的计算
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