【单选题】电路如图所示,电流I为4. 5A,如果理想电流源断路,则I为多少?
【简答题】如图所示电路中,N为线性有源二端网络,测得A,B之间电压为9V,如图(a)所示;若连接如图(b)所示,可测得电流I =1A。现连接成图(c)所示形式,问电流I 为()A。【图片】
【简答题】如图所示电路,元件A的伏安特性为U=I 2 +1(I>0),求电流I和I 1 。
【简答题】听力原文:Every Roman town had a forum at its centre, where people came together to conduct their official and religious affairs. In addition, the forum was used as a meeting place. (83)
【简答题】Each town had its "fast" set which prided itself on its unconventionality... (Para.8)
【简答题】《诗经》是我国第一部诗歌总集。收录了自西周初年至春秋中叶约五百年间的作品。《诗经》通称为《 》或《 》,到( )代,儒家把它奉为经典才称《诗经》,共305篇。 内容分为“( )”、“( )”、“( )”三部分。“风”又叫“( )”共160 篇,大都是各地民间歌谣,这是《诗经》的精华,如《伐檀》、《硕鼠》。《诗经》是我国...
【简答题】The town is famous for its magnificent church towers.
【简答题】某闭合电路中,电源的电压为定值,电流I(A)与电阻R(Q)成反比例,其图象如图所示,电流I与电阻R的函数关系式为______.
【单选题】Before the telephone was ______ , man had no way of talking to each other except face to face.