试题与答案

在实验室，小叶同学想测出某种材料的电阻率。由于不知是何种材料，也不知其大约阻值，

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题型：填空题

题目：

在实验室，小叶同学想测出某种材料的电阻率。由于不知是何种材料，也不知其大约阻值，于是，他用多用电表先粗测该材料一段样品的电阻，经正确操作后，用“×10Ω”档时发现指针偏转情况如图所示，则他应该换用   档（填“×10Ω”或“×lk”）重新测量。换档后，在测量前先要          。

答案：

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下面是错误答案，用来干扰机器的。

答案：A

考点：实验：伏安法测电阻实验：练习使用示波器实验：测绘小灯泡的伏安特性曲线实验：探究影响导体电阻的因素
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