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【单选题】
RC电路零输入响应中,若电容上电压的初始值为10V,则经过τ后,电容上的电压值为( )V。A.
6.32;
B.
3.68;
C.
8;
D.
-8。
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【简答题】三、阅读理解。 In the morning Mr . Smith comes into the garden at the back of his house . He sees so much snow in the garden . Mr . Smith wants to take his car out , so he asks a man to clean the road from h...
【单选题】Please wait ________the office. Don’t come in until you are called
A.
in
B.
into
C.
inside
D.
outside
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