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【判断题】
如果有一个字符串，其中第十个字符为'\n'，则此字符串的有效字符为9个。A.
正确
B.
错误
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【简答题】阅读理解。 It was a cold grey day in late November. The weather had changed overnight, when a backing wind brought a pale sky and a muzzling rain with it, and although it was now only a little after two o'...
【简答题】在图所示的电路中,换路前电路已处于稳态,已知R=2Ω ,电压表的内阻为2.5 kΩ,电源电压U=4 V。试求开关S断开瞬间电压表V两端的电压是多少V?,是否出现过载?是否需要保护器件,假如给定一个下正上负的二极管,相对于电压表V,是并联接入,还是串联接入?
【简答题】This happened in London It was November and the weather was very wet and cold. A Frenchman had caught a very bad cold. He coughed day and night, so he decided to go and get some medicine for his cough...
【简答题】已知电路如图所示，U S =6V，R 1 =3kΩ，R 2 =2kΩ，C=5μF，换路前，电路已处于稳态。t=0时，S开关闭合，试求u C 、i C 。
【单选题】It ________ be really cold in November in Hefei though we usually have warm and sunny days. [ ]
A.
should
B.
will
C.
must
D.
can
【简答题】It happened in November ________ the weather was wet and cold.
【简答题】已知电路如图a所示，R=1.5kΩ，L=15H，U S =18V，换路前，电路已处于稳态。t=0时，S开关闭合，试求i L 、u L ，并画出其波形。
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