有图如图6.5所示，试求：

A . 20V B . 10V C . -8V D . 8V

A . 电流从A流向B B . 电流从B流向A C . 无法判定 D . 没有电流流过

如图2.4.3所示电路中，<img src='https://img2.soutiyun.com/ask/2019-06-20/929868155228174.png' /><img src='https://img2.soutiyun.com/ask/2019-06-20/929868169658199.png' />

电路如图题 10-6所示,已知<img src='https://img2.soutiyun.com/ask/2020-07-24/964447303300445.png' />,试求u(t)。 <img src='https://img2.soutiyun.com/ask/2020-07-24/964447314547089.png' />

<img src='https://img2.soutiyun.com/ask/2020-09-29/970247647044413.png' />

由N个分子组成的气体,其分子速率分布如图9-5所示。 <img src='https://img2.soutiyun.com/ask/2020-05-11/958045854389356.png' /> (1)求常数a的值: (2)试求速率在1.5v0~2v0之间的分子数目: (3)试求分子的平均速率。

<img src='https://img2.soutiyun.com/ask/2020-04-27/956851516641686.png' />

如图(a)所示，半径为r的圆形梁截面，切掉画阴影线的部分后，反而有可能使抗弯截面系数增大(何故？)。试求使W为极值的α，并问这对梁的抗弯刚度有何影响？ <img src='https://img2.soutiyun.com/ask/uploadfile/5757001-5760000/efd41c87e9ab3d308bc4cc4ad41d930d.png' />

在图20.32所示两个电路中，当控制端存在<img src='https://img2.soutiyun.com/latex/latex.action' />两种情况时，试求输出Y的波形。输入A和B的波形如图中所示。 <img src='https://img2.soutiyun.com/ask/uploadfile/5457001-5460000/e4d1d7d441da99856c8b60f88709eed1.png' />

计算题：如图D-8所示正弦交流电路，试求电路发生谐振时，电源的角频率<img src='https://img2.soutiyun.com/shangxueba/ask/18276001-18279000/18277262/2015052011431518944.png' />应满足的条件。 <img src='https://img2.soutiyun.com/shangxueba/ask/18276001-18279000/18277262/2015052011424718663.png' />

<img src='https://img2.soutiyun.com/ask/2020-06-28/962202187481013.png' />

由负边沿JK，触发器F1和F0组成的时序逻辑电路如图4.21(a)(教材图4.18)所示。试求:(1)写出电路的输出方程、驱动方程和状态方程;(2)列出A=1时的状态转换表,画出波形图(画4个CP);(3)若A=0,则电路的工作情况如何？ <img src='https://img2.soutiyun.com/ask/2020-07-10/963247479671612.png' /> <img src='https://img2.soutiyun.com/ask/2020-07-10/96324749257235.png' />

电路如图1-73所示，换路前已处于稳态，试求换路后(t≥0)的uc。 <img src='https://img2.soutiyun.com/ask/2020-06-11/960741665697309.png' />

电路如图16.32所示。知<img src='https://img2.soutiyun.com/ask/2020-10-06/970865881862183.png' /><img src='https://img2.soutiyun.com/ask/2020-10-06/970865902381357.png' />试求:u_o. <img src='https://img2.soutiyun.com/ask/2020-10-06/970865916234149.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-19/979900114706218.jpg' />

电路如图题6-24所示,试求i(t)的零状态响应;若<img src='https://img2.soutiyun.com/ask/2020-10-15/971629862509378.jpg' />,试求i_L(t)的零输入响应.如果i_L(0_-)=-1A,求i_L(t)的全响应. <img src='https://img2.soutiyun.com/ask/2020-10-15/971629892986121.jpg' />

一无限长圆柱面,其电荷面密度为<img src='https://img2.soutiyun.com/ask/2020-04-30/957107726124018.png' />.式中<img src='https://img2.soutiyun.com/ask/2020-04-30/957107739133835.png' />为半径R与x轴所夹的角，如图5-21所示。试求圆柱轴线上一点的场强。 <img src='https://img2.soutiyun.com/ask/2020-04-30/957107750785014.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-31/967737244688332.png' />