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【简答题】
指出题图属于什么电路,并计算R f 的阻值。 (R 1 =5.1KΩ , u i =0.2V , u o =-3V) ( 图参阅书 P165 图 4-10 ) (2)u i =10 sin314tV, A uf =-10 ,画出u o 的波形? (3)R 1 =5K Ω, A uf =-10 ,求R f ?
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【简答题】补全对话 从方框中所给的选项中选择正确的句子补全以下对话（10分） A:Hello! May I speak to Sally? B: 小题1: May I take a message? A:Yes. This is her friend Maria calling. Would you please ask Sally to bring a VCD of popular songs to th...
【判断题】阅读理解,判断下列句子的正误Her aunt didn't think that girls could be good at math. ( ) Sally was fourteen. She studied in a middle school. She liked dancing and singing and spent a lot of time on them. Bu...
A.
正确
B.
错误
【单选题】关于平面构成中的点的概念,下列叙述正确的是( )。
A.
平面构成中的点只有位置，而无面积、大小和外形轮廓
B.
平面构成中的点既有位置，也有面积、大小、浓淡和外形轮廓
C.
平面构成中的点与线、面的区别可以数字地进行量化
D.
平面构成中的点是绝对的，并不由与其它元素的相对关系决定
【简答题】Steven drives a school bus, but his bus isn’t the same as other school buses because there aren’t any children on it. There are only dogs. Steven’s bus takes dogs to school at 8:00 in the morning and ...
【单选题】1 have lunch at school, but my mother_______ lunch at school.
A.
isn't have
B.
hasn't have
C.
don't have
D.
doesn't have
【单选题】The wholesaler regulates the flow of goods by______.
A.
running level with manufacturers' production
B.
holding down stock of commodities
C.
keeping stock for stronger demand
D.
adjusting the prices of goods in time
【简答题】A) designates B) fluctuates C) calculates D) regulates
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