【简答题】(武汉大学2007年考研试题)如图11一14所示电路,已知Us=4δ(t)V,R1=3Ω,R2=6Ω,C=0.1μF。试求电路的冲激响应i(t)、uc(t)。
【单选题】图 T14-4 所示电路 中 A 点的电位 为
【单选题】—What kind of stories do you like? —I prefer stories ______ have happy endings. [ ]
【单选题】Regarding to the basic stories, which of the following match is false?
A.
Tristan—an alienated traveler who will never return home.
B.
Cinderella—the story of the “dream comes true”.
C.
Achilles—an invulnerable hero with a fatal flaw.
D.
Romeo and Juliet—star-crossed lovers.
【单选题】In the writer's opinion, fairy stories ______.
A.
have a very bad effect on children
B.
have advantages in cultivating children's imagniativity
C.
help children to come to terms with fears
【简答题】试求图4-14所示电路的零状态响应u C (t)。
【单选题】Whose stories have been told to illustrate the point?
A.
Abraham Lincoln’s stories
B.
the lady's Africa trip
C.
Dale Carnegie’s stories
D.
Dale Carnegie’s and Abraham Lincoln’s stories
【单选题】听到喊声的老板,抬头瞥了他们三人一眼,应声回答道:“好咧!清汤荞麦面一碗——”。破折号的作用是表示( )
【简答题】(浙江大学2006年考研试题)图14—33所示电路中,已知激励为u1(t),输出电压u2(t)的冲激响应为 ,求:(1)网络函数 ;(2)在复平面上画出其极点图;(3)求参数L和C的值;(4)当激励为 时,求输出电压u2(t)的稳态响应。注:e-atsincot的拉普拉斯变换为 。