如图7-37所示电路，，t=0时闭合开关S后，为下列选项中的（）。https://assets.asklib.com/psource/2015110111284334551.jpg

A . 6.67（1-） B . 10V C . 10（1-） D . 6.67+3.33

A . 126e-3 B . 126（1-e-3） C . 126（1+e-3） D . 4-3e-3

A . 1 B . 0.5 C . 2 D . 0.25

A . 3 B . 0 C . 6 D . -3

A .https://assets.asklib.com/psource/2015110111313843578.jpg B .https://assets.asklib.com/psource/2015110111315151618.jpg C .https://assets.asklib.com/psource/2015110111320582310.jpg D .https://assets.asklib.com/psource/2015110111323019711.jpg

A . 100 B . 250 C . -250 D . -100

A . 4.5-0.5https://assets.asklib.com/psource/2015102909090699957.jpg A.B . 4.5-4.5https://assets.asklib.com/psource/2015102909090699957.jpg A.C . 3+0.5https://assets.asklib.com/psource/2015102909090699957.jpg A.D . 4.5-0.5https://assets.asklib.com/psource/2015102909090699957.jpg A.

A . A B . B C . C D . D

A . 2.5 B . -2 C . 2 D . -2.5

A .https://assets.asklib.com/psource/2015110111263771750.jpg B .https://assets.asklib.com/psource/2015110111265468337.jpg C .https://assets.asklib.com/psource/2015110111270839970.jpg D .https://assets.asklib.com/psource/2015110111272147763.jpg

A . ['['L/R3B .https://assets.asklib.com/psource/2015110111201458733.jpg C .https://assets.asklib.com/psource/2015110111202959174.jpg D .https://assets.asklib.com/psource/201511011120497322.jpg

如图5.4.10所示电路中，t＜0时，电路已处于稳态，t=0时开关闭合，求t≥0₊时ic(t)。 <img src='https://img2.soutiyun.com/ask/2020-02-27/951671752554798.jpg' />

-1A 2A 1A 0A

<img src='https://img2.soutiyun.com/ask/2020-06-17/961264067053561.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/18495001-18498000/18496804/2015110114005030374.jpg' /> A．0 B． 0.6 C． 0.3 D． 0.03

<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111311967106.jpg' /> A．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111313843578.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111315151618.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111320582310.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111323019711.jpg' />

<img src='https://img2.soutiyun.com/shangxueba/ask/18525001-18528000/18526549/201511011401317578.jpg' /> A．2.5 B． -2 C． 2 D． -2.5

电路如图题6-33所示,求<img src='https://img2.soutiyun.com/ask/2020-10-15/971631143700658.png' /><img src='https://img2.soutiyun.com/ask/2020-10-15/971631160210602.png' />已知开关在t=0时闭合,闭合前电路已处于稳态. <img src='https://img2.soutiyun.com/ask/2020-10-15/971631172391299.png' />

电路如图所示，Is=3A，Us=18V，R1=3Ω，R2=6Ω，L=2H，在t＜0时电路已处于稳态。当t=0时开关S闭合，求t≥0时的i_L、u和i(t)。 <img src='https://img2.soutiyun.com/ask/uploadfile/5499001-5502000/c59f97db78e22204b83620ad1e292af9.jpg' />

图4-4所示电路,t=0时,开关S闭合,求v_c(t). <img src='https://img2.soutiyun.com/ask/2020-12-01/975674141499809.png' />

<img src="https://img2.soutiyun.com//1/2021-05-05/989071849627999.png"/> 图18

A．6V B．4V C．0V D．8V

A．78V B．117V C．135V D．39V