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【单选题】
图所示电路原已处于稳定,在 t=0。则t>0时电压u(t)的形式可能为( )。A.
Ke pt
B.
K 1 +K 2 e pt
C.
K
D.
(K 1 +K 2 t)e pt
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反馈参考答案：
举一反三
【单选题】Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.
A.
waited, happened
B.
have waited, has happened
C.
had waited, was happened
D.
had been waiting, had happened
【单选题】The old man started living in the old house ______Tom was born.
A.
as soon as
B.
long, long before
C.
soon after
D.
years after
【单选题】The reason why Tom started his AWeber is that _______.
A.
he tried to create tools for effective email follow up
B.
sales experts around the world asked him to help
C.
he tried to build the trust among the small businesses
D.
he wanted to help business owners do business online
【单选题】Tom took out a piece of paper he and started reading in a clear tone.
A.
was preparing
B.
would prepare
C.
have prepared
D.
had prepared
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