【简答题】动词变位:Niño, ............... (callarse) por favor !
【多选题】如图所示,5个元件代表电源或负载。电流和电压的参考方向如图中所示,今通过实验测知:I1=-4A, I2=6A, I3=10A,U1=140V,U2=-90V,U3=60V,U4=-80V,U5=30V判断这五个元件中哪几个是电源?
【简答题】Niño, ............... (callarse) por favor !
【单选题】Are you______spending more money on the space program?
【单选题】Some people are in favor of the proposition because they think
A.
it may reduce the number of teenage pregnancies.
B.
it might protect girls from being raped.
C.
the current law is not fair to all girls.
D.
the current law is attacked by many parents.
【单选题】中国传统翻译理论中,——提出了“案本”的翻译标准?
【单选题】以客观存在的节点为未知量,直接应用 KCL 和 KVL 求解电路的方法,称为
【简答题】在题1.5.9图中,5个元器件代表电源或负载。电流和电压的参考方向如图中所示。通过实验测量得知 I1=-4A I2=6A I3=10A U1=140V U2=90V U3=60V U4=-80V U5=30V (1)试标出各电流的实际方向和各电压的实际极性(可另画一图)。 (2)判断哪些元器件是电源?哪些是负载? (3)计算各元器件的功率,电源发出的功率和负载取用的功率是否平衡?
【简答题】下图所示电路,7个元件代表电源或负载,电流和电压的参考方向如图所示,实验测得:I 1 =0.5A,I 2 =-0.5A,I 3 =1A,U 1 =3V,U 2 =4V,U 3 =5V,U 4 =-6V,U 5 =12V,U 6 =-2V,U 7 =-10V。