---_________ is the way from your hometown? ---Maybe it’s about 20km from here, but I’m not sure.

题干

---_________ is the way from your hometown?
--

-Maybe it’s about 20km from here, but I’m not sure.

A：How far

B：How long

C：How many

D：How soo

上一题下一题 0.0难度选择题更新时间:2018-01-03 04:09:34

A

如图是电饭锅工作原理的简化电路图，电饭锅有两档，分别是高温烧煮和低温焖饭，S₁为档位自动控制开关，R₀和R均为电热丝，R₀的阻值为1210Ω，该电饭锅铭牌技术参数如表所示（低温焖饭档额定功率模糊不清）．求：

①电饭锅高温烧煮0.5h消耗的电能；

②电饭锅低温焖饭时的额定功率；

③电热丝R的阻值．