某电压源支路，端电压U和端电流I参考方向如图所示，在下列表达式中正确的伏安关系是（）。[img=173x255]17e0b6a77bb5856.png[/img] A: U=US+I*R B: U=—US—I*R C: U=—US+I*R D: U=US—I*R
某电压源支路，端电压U和端电流I参考方向如图所示，在下列表达式中正确的伏安关系是（）。[img=173x255]17e0b6a77bb5856.png[/img] A: U=US+I*R B: U=—US—I*R C: U=—US+I*R D: U=US—I*R
Sentence like “I will try to ...” shows us ( ) while sentence like “I will do ...” gives us a feeling of ( ).
Sentence like “I will try to ...” shows us ( ) while sentence like “I will do ...” gives us a feeling of ( ).
理想电压源的源电压为US，端口电流为I，则其内阻为( )。 A: I/US B: 无穷大 C: US/I D: 0
理想电压源的源电压为US，端口电流为I，则其内阻为( )。 A: I/US B: 无穷大 C: US/I D: 0
理想电压源的源电压为Us，端口电路为I，则其内阻为 A: 0 B: 无穷大 C: Us/I D: I/Us
理想电压源的源电压为Us，端口电路为I，则其内阻为 A: 0 B: 无穷大 C: Us/I D: I/Us
They invited the three of______,Tom, Bob, and _____. A: us , me B: we , I C: us , I D: we , we
They invited the three of______,Tom, Bob, and _____. A: us , me B: we , I C: us , I D: we , we
He invited the three of ______, Bob, Tom and ______. A: we; me B: us; I C: we; I D: us; me
He invited the three of ______, Bob, Tom and ______. A: we; me B: us; I C: we; I D: us; me
10. _______I was in the US, I made a lot of American friends.
10. _______I was in the US, I made a lot of American friends.
I’ve _______ pizza for us all. I hope that is OK?
I’ve _______ pizza for us all. I hope that is OK?
如图示电路中，当Us=0时，I= - 6A，求Us=18V时，I的值。【图片】
如图示电路中，当Us=0时，I= - 6A，求Us=18V时，I的值。【图片】
电路如图所示，[img=227x140]17d60e9728cfa32.png[/img]已知Us=2V时，I=1A，则当Us=4V时，I=2A。 （ ）
电路如图所示，[img=227x140]17d60e9728cfa32.png[/img]已知Us=2V时，I=1A，则当Us=4V时，I=2A。 （ ）