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【单选题】
【稳压二极管稳压电路输入电压为10V,需要给负载200K欧姆电阻输出稳定直流电压5V,所以选取IN4625稳压二极管,其参数:Uz=5V,Iz=55mA。请为该电路选取合适的稳压电阻。】 根据题意,正常工作时,稳压电阻将消耗多少电压( )【即稳压电阻两端电压】A.
10V
B.
5V
C.
15V
D.
0V
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【简答题】A．He's been too busy to clean his room. B．Cleaning is the last thing he wants to do. C．He hasn't cleaned his room since Linda visited him. D．Linda is the only person who ever comes to see him.
【单选题】—You did so much work today.You must be very tired. —No,I’m not_________tired.
A.
a little
B.
rather
C.
fairly
D.
a bit
【简答题】Think and write.根据句意及首字母提示写出动物单词。 1. I'm very tall. I'm a g . 2. I'm a p . I'm very fat, I'm black and white. 3. It has stripes. It's a z . 4. It lives in a hole. It's long. It's a s . 5. It has a tru...
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