电路如图 2 所示, N 为独立源的线性电阻电路,已知:当 U s =8V , I s =0A 时, U =6V ;当 U s =0V , I s =2A 时, U =0V ;当 U s = - 4V , I s = - 1A 时, U =2V ;当 U s =4V , I s =3A 时, U 为( )。 图2
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【单选题】The______of the building are covered with lots of .
【简答题】阅读理解. The best thing you can say about the roofs of most city buildings is that you don't have to look at them much. That's very good, since an landscape viewed from above can be an unlovely thi...