题干

如图所示,a、b端输入恒定的交流电压。理想变压器原、副线圈分别接有额定电压均为12V,额定功率均为2W的灯泡A,B,C。闭合开关,灯泡均正常发光。则下列说法正确的是(   )

A:原副线圈的匝数比为1:2

B:电压表V的示数为24V

C:变压器的输入功率为4W

D:副线圈上再并联一个相同的灯泡D,灯泡A会烧坏

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C,D

同类题1

       The Oxford English Dictionary (OED, 牛津英语词典) is thinking of adding the Chinese word tuhao (土豪) to its 2014 edition (版本).
The word has become popular in China during the past few months to describe newly rich people who spend money in extravagant(铺张的,浪费的)ways. Tuhao has caught on in Western countries, too, to describe similar people in their countries.
       The adoption (采用) of the word by foreign countries is an example of China's spreading influence in the world not just economically, but also socially and culturally. People are paying attention to what is happening in China and are picking up some Chinese words in the process, especially those words that express unique (独特的) Chinese ideas that cannot be easily translated (翻译) into English.
       The OED is also thinking of adding hukou (户口) and dama (大妈) to the already 120 Chinese words in its dictionary. Hukou refers to (指的是) China's system of residency permits (户籍系统) and dama refers to middle-aged Chinese women whose gold buying habits influence the global gold markets. The news that the OED was adding these words has met with some criticism (批评). Some people say the words embarrass (使人尴尬) China, but others insist that in a globalized (全球化的) society it’s natural for words to spread and be adopted elsewhere. In fact, a word like tuhao expresses the humor of China. It's easy to pronounce (发音) and very accurate (精准的) at poking fun at (嘲弄) rich people who have more money than taste.