问题
计算题
CFXB型“220V 1100W”电饭堡有两档开关，如图所示。档2是高温烧煮；档1是焖饭、保温。当接档“2”时，电路的功率为1100W；当接档“1”时。电路的总功率为22W。（虚线框内为电饭堡的简易原理示意图） 求：串联电阻R的阻值。
答案
2154欧
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CFXB型“220V 1100W”电饭堡有两档开关，如图所示。档2是高温烧煮；档1是焖饭、保温。当接档“2”时，电路的功率为1100W；当接档“1”时。电路的总功率为22W。（虚线框内为电饭堡的简易原理示意图） 求：串联电阻R的阻值。
2154欧
According to the Chinese Association on Tobacco Control, about 350 million Chinese smoke. Among them, 50 million are teenagers. Sun Jiangping of Beijing University said, “ Teenagers can get cigarettes 3 , especially when their parents smoke or shops sell cigarettes to them. It’s very important for parents to help their children 4 smoking.” A 15-year-old boy 5 Li Kun from Beijing said his parents didn’t smoke. Because they 6 smoking could make people feel 7 ill, they only 8 him to play with friends without smoking. 9 in such a good family helped Li say no to cigarettes. Some of his smoking classmates once told Li that smoking made boys look cool, but Li disagreed. He said, “Smoking is 10 and it’s not cool at all. Please stop smoking now!” |