【简答题】“ Tear ’ em apart! ” “ Kill the fool! ” “ Murder the referee ( 裁判 )! ” There are common remarks one may hear at various sporting s. At the time they are made, they may seem innocent enough. But l...
【单选题】The circuit is shown in the figure, we have known that i1 = -1A, u2 = 2V, then the voltage of the voltage source us is equal to _____V. Choose A,B,C or D.