题目内容
电饭锅工作时有两种状态:一种是锅内水烧开前的加热状态,另一种是锅内水烧开后的保温状态,如图所示是一学生设计的电饭锅电路原理示意图,S是用感温材料制造的开关。下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035466084193.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035466084193.png)
A.加热状态时是用R1、R2同时加热的 |
B.当开关S接通时电饭锅为加热状态,S断开时为保温状态 |
C.当![]() ![]() |
D.当![]() ![]() |
BD
试题分析:由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003546702606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003546639352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003546702606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035467641111.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003546780750.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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