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【简答题】
Ask your classmates about their online activities. and make up a dialogue. the following questions may help you? 1. how many hours do you spend online everyday? 2. what do you do online? 3. What do you think of online shopping? 4. What do you think of online games? ....
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【简答题】What is Bay? The answer is that it is a global trading platform. where nearly anyone can tradepractically anything. People can sell and buy all kinds of products and goods.Including cars, movies...
【单选题】求函数1/(s^2+1)+1的拉普拉斯逆变换( )
A.
sin2tu(t)+δ(t)
B.
sin2tu(t)-δ(t)
C.
sintu(t)+δ(t)
D.
sintu(t)-δ(t)
【简答题】选出你所听到的句子。 ( )1. A. I have heard that China will visit the moon by ship. B. I have heard that China will visit the moon by space. C. I have heard that China will visit the moon by spaceship. ( ...
【单选题】中国传统儒家设计“使老有所终,壮有所用,幼有所长,鳏寡孤独废疾者皆有所养”的大同社会,近代资产阶级追求“民族、民权、民生”的资产阶级共和国,共产党人和广大劳动人民向往“各尽所能,按需分配”的共产主义社会。这些对未来的设计、追求、向往,都属于人生理想中的( A )
A.
会理想
B.
德理想
C.
业理想
D.
活理想
【单选题】函数ln(s/s+9)的拉普拉斯逆变换为
A.
1/t(e^-9t -1)
B.
/2t(e^-9t -1)
C.
2/t(e^-9t -1)
D.
2/3t(e^-9t -1)
【简答题】用拉普拉斯变换求解微分方程 满足初始条件y(0)=y'(0)=0的解. 解:设拉普拉斯变换L[y(t)]=Y(s),于是有 L[y']=x1-y(0),L[y'']= Y(s)-x2-y'(0), 由已知立得: L[y']=x1,L[y'']= Y(s), 在方程两边取拉普拉斯变换,得: Y(s)-2x1+Y(s)= , 即:Y(s)= , 因此,求逆变换得:y(t)= . 这里,x1= , x2...
【简答题】Never in my life ____ such a thing. A、 I have heard or have seen B、 have I heard or seen C、 I have heard or seen D、 did I hear or see
【简答题】求下列函数的拉普拉斯逆变换: 1.F(S)= 2.F(S)= 3.F(S)= 4.F(S)=
【简答题】请用IF语句设计一个2-to-4译码器,真值表如图所示
相关题目：
【单选题】求函数1/(s^2+1)+1的拉普拉斯逆变换( )
A.
sin2tu(t)+δ(t)
B.
sin2tu(t)-δ(t)
C.
sintu(t)+δ(t)
D.
sintu(t)-δ(t)