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下列事实中能产生不当得利之债的是( )。 A．甲某主动帮外出邻居修缮被风吹倒的围墙 B．甲某主动提前清偿其欠乙的债务 C．由于送件人失误，甲某收到了他人所订的羊绒大衣 D．甲某捡到他人丢失的MP4并拿回家自己使用
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【简答题】要将电流转换为电压,选用()负反馈;要将电压转换为电流,选用()负反馈。
【简答题】在模拟信道中,常用带宽表示信道传输信息的能力,带宽即传输信号的()与()之差。
【单选题】听力原文：M: The University Bookstore opens at nine in the morning. W: Oh dear, I need a textbook for my eight o'clock class today. Q: What does the woman mean? (15)
A.
She won't be able to get the book before class.
B.
The books there are too expensive.
C.
She hopes to get a good deal on some second-hand books.
D.
The textbook she needs isn't in yet.
【单选题】听力原文：W: Oh dear, what an awful weekend! M: Couldn't be worse ! Q: What does the man mean? (16)
A.
They had a happy weekend.
B.
It was not so bad as the woman thought.
C.
The woman's health is getting worse.
D.
He agrees with the woman.
【简答题】箍筋和弯起钢筋称为 或 。
【简答题】箍筋和弯起钢筋统称为 或 。
【单选题】听力原文：W: Oh, dear! I'm exhausted. I can't walk any further. M: Let's go to the cafe opposite the China bank and have a rest. Q: Where does this conversation most probably take place? (13)
A.
At a bank.
B.
On the street.
C.
At home.
D.
In a cafe.
【简答题】在模拟信道中,常用带宽表示信道传输信息的能力,带宽即传输信号的____________和____________之差。
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