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.家庭电路中的保险丝熔断了，以下原因中不可能的是（ ）
| A: 家庭中用电器的总功率过大 |
| B: 电灯开关中的两根导线相碰 |
| C: 保险丝的规格不合适，熔断电流太小 |
| D: 插头中的两根导线相碰 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOS/nemZqeS4neeGlOaWreaYr+WboOS4uueUtea1gei/h+Wkpy4=
- 提示2：IOeUtea1gei/h+Wkp+eahOWOn+WboOacieS4pOS4qi4=
- 提示3：IOefrei3r+WSjOeUqOeUteWZqOi/h+Wkmi4=
- 答案：Qg==
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本课配套习题挑战模式2/5
单选题
难度系数：
2.下列三个现象：①灯头里的两个线头相碰；②插座中的两线头相碰；③照明电路的开关里两线头相碰. 其中可能引起保险丝熔断的是（ ）
| A: ①②③ |
| B: ①② |
| C: ①③ |
| D: ②③ |
一次做对，真牛！
+5奖励规则>
- 提示1：IOS/nemZqeS4neeGlOaWreaYr+WboOS4uueUtea1gei/h+Wkpy4=
- 提示2：IOeUtea1gei/h+Wkp+eahOWOn+WboOacieS4pOS4qi4=
- 提示3：IOefrei3r+WSjOeUqOeUteWZqOi/h+Wkmi4=
- 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.如图所示，多孔插座冒烟的主要原因是由于电路中（ ）
| A: 总电量太大 |
| B: 总电阻太大 |
| C: 总电流太大 |
| D: 总电压太高 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOaAu+eUtemHj+WSjOaXtumXtOacieWFsw==
- 提示2：IOeUtemYu+Wkp++8jOeUtea1geWwj++8jOS6p+eUn+eDremHj+S9juOAgg==
- 提示3：IOaAu+eUteWOi+aYr+eUtea6kOeUteWOizIyMFbjgII=
- 答案：Qw==
5o+S5bqn5YaS54Of55qE5Y6f5Zug55S15rWB6L+H5aSn77yM5b2T5ZCM5LiA5Liq5o+S5bqn5LiK5o6l6L6D5aSa55qE55So55S15Zmo5pe277yM5oC75Yqf546H6L+H5aSn77yM55S15rWB5bCx5aSn77yM5L2/5a+857q/5Y+R54Ot6ICM5YaS54Of77yM5Y+m5LiA5Liq55S15rWB6L+H5aSn55qE5Y6f5Zug5piv5Y+R55Sf5LqG55+t6LevLiA8YnI+5pWF6YCJQy4g
本课配套习题挑战模式4/5
单选题
难度系数：
4.下列做法，符合安全用电原则的是（ ）
| A: 靠近高压带电体 |
| B: 家用电器起火时，先灭火，后切断电源 |
| C: 家庭电路中，控制灯泡的开关装在零线上 |
| D: 有金属外壳的家用电器使用三脚插头 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOS4jeaOpeinpuS9juWOi+W4pueUteS9k++8m+S4jemdoOi/kemrmOWOi+W4pueUteS9ky4=
- 提示2：IOeUqOeUteWZqOedgOeBq+aXtu+8jOW6lOWFiOWIh+aWreeUtea6kO+8jOWGjemHh+WPlumAguW9k+eahOeBreeBq+aOquaWvQ==
- 提示3：IOaOp+WItueUteeBr+eahOW8gOWFs+W6lOWuieijheWcqOeBq+e6v+S4jueBr+S5i+mXtC4=
- 答案：RA==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.关于家庭电路的下列做法，不符合安全用电常识的是（ ）
| A: 发现有人触电，应首先切断电源 |
| B: 检修电路故障时，应尽量在通电情况下作业 |
| C: 有金属外壳的用电器，金属外壳一定要接地 |
| D: 为了保证电路安全，家里尽量不要同时使用多个大功率电器 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOinpueUteWNs+WPr+WIh+aWreeUtea6kOOAgg==
- 提示2：IOWmguaenOemu+eUtea6kOWkqui/nO+8jOeUqOe7nee8mOS9k+aKiueUtee6v+aLqOW8gOOAgg==
- 提示3：IOmHkeWxnuWkluWjs+imgeaOpeWcsO+8jOeUtei3r+WKn+eOh+iOq+i/h+Wkp+OAgg==
- 答案：Qg==
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
