图示电路中，R=1kΩ，C=1μF，Ui=1V，电容无初始储能，如果开关S在t=0时_爱下问搜题

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问题单项选择题

图示电路中，R=1kΩ，C=1μF，U_i=1V，电容无初始储能，如果开关S在t=0时刻闭合，则给出正确的输出电压波形是（）。

A．图(a)

B．图(b)

C．图(c)

D．图(d)

答案

参考答案：C

解析：

电容无初始储能，U_C=0，根据换路定理，换路瞬间电容电压不能突变。

填空题

从方框中选词并用其适当形式补全短文。

family healthy year American food orange parent potato be speak

     My name is Peter.  I'm 13    1    old.  I'm from    2    ,  but I can    3   Chinese well.  Ice cream is my
favourite    4   , but it's unhealthy.  I like carrots,    5    and rice.  I also like apples,  bananas and    6   . I
have got a big    7   . There   8    seven people in my family-my grandparents, my    9   , my uncle,  my
sister and me.  My grandparents are very old,  but they are in good   10  .

问答题论述题

民族传统体育有哪几种分类？