中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.小明通过实验研究电阻大小与哪些因素有关，他找到四根金属线如图所示，图中A为锰铜线，B、C、D为镍铬合金线，S表示横截面积。在研究电阻的大小与导体材料的关系时，他选择了其中两根金属导线分别进行实验比较，应选择（）
| A: A和B |
| B: A和D |
| C: B和C |
| D: B和D |
一次做对，真牛！
+5奖励规则>
- 提示1：5o6n5Yi25Y+Y6YeP5rOV
- 答案：QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.下列物质中都是导体的是（）
| A: 铜丝、橡皮、石墨 |
| B: 大地、食盐水溶液、人体 |
| C: 塑料、橡胶、玻璃 |
| D: 陶瓷、干木头、金属 |
一次做对，真牛！
+5奖励规则>
- 提示1：5bi46KeB55qE5a+85L2T5YyF5ous77ya5Lq65L2T44CB5aSn5Zyw44CB5ZCE56eN6YeR5bGe44CB6YW456Kx55uQ55qE5rq25ray562J77yO5bi46KeB55qE57ud57yY5L2T5pyJ6Zm255O344CB546755KD44CB5qmh6IO244CB5rK5562J77yb5a+85L2T5ZKM57ud57yY5L2T5rKh5pyJ57ud5a+555qE55WM6ZmQ
- 答案：Qg==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.关于影响电阻大小的因素，下列说法中正确的是（）
| A: 导体长度越长，电阻越大 |
| B: 导体温度升高时，电阻一定增大 |
| C: 导体横截面积越小，电阻越小 |
| D: 不考虑温度的影响时，粗细相同的铜导线，越长的电阻越大 |
一次做对，真牛！
+5奖励规则>
- 提示1：55S16Zi75piv5a+85L2T5pys6Lqr55qE5LiA56eN5oCn6LSo77yM5a6D55qE5aSn5bCP5Y+q5LiO5a+85L2T55qE5p2Q5paZ44CB6ZW/5bqm44CB5qiq5oiq6Z2i56ev44CB5rip5bqm5Zub5Liq5Zug57Sg5pyJ5YWz
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.把一段导体均匀拉长后，它的电阻将（ ）
| A: 变大 |
| B: 不变 |
| C: 变小 |
| D: 无法确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：55S16Zi75piv5a+85L2T5pys6Lqr55qE5LiA56eN5oCn6LSo77yM5a6D55qE5aSn5bCP5Y+q5LiO5a+85L2T55qE5p2Q5paZ44CB6ZW/5bqm44CB5qiq5oiq6Z2i56ev44CB5rip5bqm5Zub5Liq5Zug57Sg5pyJ5YWz
- 答案：QQ==
5Zyo5a+85L2T5p2Q5paZ5ZKM5qiq5oiq6Z2i56ev5LiA5a6a5pe277yM5a+85L2T6LaK6ZW/77yM55S16Zi76LaK5aSn77yb5p2Q5paZ5ZKM6ZW/5bqm5LiA5a6a5pe25qiq5oiq6Z2i56ev6LaK5bCP55S16Zi76LaK5aSn77yO5pWF5a+85L2T6KKr5ouJ6ZW/5ZCO55Sx5LqO6ZW/5bqm5Y+Y5aSn44CB5qiq5oiq6Z2i56ev5Y+Y5bCP77yb5omA5Lul55S16Zi75Y+Y5aSn77yO5pWF6YCJQS4=
本课配套习题挑战模式5/5
单选题
难度系数：
5.用同种材料制成的粗细均匀的某段金属导体，对于其电阻大小下列说法正确的是（）
| A: 当导体两端电压和通过导体的电流为零时，导体的电阻为零 |
| B: 当导体被均匀拉长至原来的二倍时，它的电阻减小为原来的一半 |
| C: 电阻是导体本身的一种性质，所以温度不论如何变化，它的电阻也不可能为零 |
| D: 电阻是导体本身的一种性质，与电压和电流无关 |
一次做对，真牛！
+5奖励规则>
- 提示1：5a+85L2T55qE55S16Zi75piv5a+85L2T5pys6Lqr55qE5LiA56eN5oCn6LSo77yM5aSn5bCP5Yaz5a6a5LqO5a+85L2T55qE5p2Q5paZ44CB6ZW/5bqm44CB5qiq5oiq6Z2i56ev5LiO5rip5bqm77yM6Lef5YW25LuW5Zug57Sg5peg5YWz
- 答案：RA==
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
