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【单选题】
Part I Listening Comprehension Section B Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. Both the conversations and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. 7.A.
To have his own business.
B.
To do social work.
C.
To move to another city.
D.
To go to study abroad.
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A.
耦合电容和旁路电容的存在
B.
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C.
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D.
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A.
耦合电容和旁路电容的存在
B.
半导体管极间电容和分布电容的存在。
C.
半导体管的非线性特性
D.
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【多选题】放大电路在高频信号作用时放大倍数数值下降的原因是( ) ,而低频信号作用时放大倍数 数值下降的原因是( ) 。
A.
半导体管的非线性特性
B.
半导体管极间电容和分布电容的存在。
C.
耦合电容和旁路电容的存在
D.
放大电路的静态工作点不合适
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A.
耦合电容和旁路电容的存在
B.
半导体管极间电容和分布电容的存在。
C.
半导体管的非线性特性
D.
放大电路的静态工作点不合适
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A.
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B.
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C.
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D.
She doesn't know whether the doctor can help her.
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