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【判断题】
放大电路正常放大的前提条件是外加电源电压的极性要保证三极管的发射极反偏,集电结正偏。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】The mother said she would ______ her son washing the dishes if he could finish his assignment before supper.
A.
let down
B.
let alone
C.
let off
D.
let out
【单选题】She is going to France on a special ______ for one of the major daily newspapers.
A.
assignment
B.
mission
C.
tour
D.
role
【单选题】听力原文：W: Why don't you go to bed, Ted? You look so bad. M: I have to finish this assignment which has to be handed in tomorrow morning. Q: Why is Ted up late? (13)
A.
His mother wants him to do his homework.
B.
He has to finish his homework.
C.
He is too excited to sleep.
D.
He doesn't know it is very late.
【单选题】What are the reasonable excuses for extensions?
A.
Planning problems.
B.
Problems with assignment deadlines.
C.
Personal illness or accident.
D.
Frequent absences from class.
【简答题】查询信息系年龄超过18岁王姓学生的学号,姓名,年龄
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