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【简答题】
图题9.17所示的电路，设二极管VD 1 、VD 2 、VD 3 和VD 4 特性相同，均为i=b 0 +b 1 u+b 2 u 2 +b 3 u 3 。已知u 1 、u 2 ，试求输出电压u o 的表达式。
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【单选题】下列5个算式中，错误的有 ①a 2 b 3 +a 2 b 3 =2a 4 b 6 ②a 2 b 3 +a 2 b 3 =2a 2 b 3 ③a 2 b 3 ·a 2 b 3 =2a 2 b 3 ④a 2 b 3 ·a 2 b 3 =a 4 b 6 ⑤2a 2 b·3a 3 b 2 =6a 6 b 2 [ ]
A.
1个
B.
2个
C.
3个
D.
4个
【单选题】______ to computer games, the boy began to dislike school, which made his parents worried.
A.
Related
B.
Addicted
C.
Connected
D.
Used
【简答题】完形填空 。 It rained for four days. Mike couldn't go out and 1 with his friends. His parents went to work and had to 2 the boy at home. They bought some 3 for him. But he didn't like to read them. He stoo...
【简答题】Daniel Olin was 11 years old when his parents moved to Canada. He liked his new school and made friends there, but then things at home started to change. His mum and dad began to argue and the argumen...
【简答题】( )与( )之间的电子商务,即 B2B(Business to Business,也称BtoB)电子商务。
【简答题】It rained for days.Mike couldn’t go out and with his friends.His parents went to work and had to the boy at home.They bought some for him.But he didn’t like to read them. He stood by the window(窗户）and...
【简答题】After he entered the university, he decided not to be dependent _____ his parents any longer. He began to work part-time to support himself.
【简答题】电子商务分两个层次：一是企业与企业间的电子商务，即B2B层次，二是企业与消费者之间的电子商务，即（）层次
【简答题】多层楼的组网通常采用常规组网方案之间的( )。
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