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【简答题】
RC振荡电路如图题4.23所示。已知：R 1 =10kΩ，V CC =V EE =12V。试分析R 2 的阻值分别为下列情况时，输出电压波形的形状。 (1)R 2 =10kΩ；(2)R 2 =100kΩ; (3)R 2 的冷态电阻大于20kΩ，且为负温度系数的热敏电阻；(4)R 2 的冷态电阻大于20kΩ，且为正温度系数的热敏电阻。
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【单选题】The girl _____ her mother . I know her mother likes reading,too.
A.
achievement
B.
familiar
【单选题】I know her ______, but I have never spoken to her.
A.
for sight
B.
in sight
C.
on sight
D.
by sight
【单选题】What does "Anglo-Saxons"refer to?
A.
Angles and Saxons from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".
B.
Angles and Saxons were from the Jutland peninsula and they were Germanic groups.
【单选题】What does "Anglo-Saxons"refer to?盎格鲁撒克逊指的是?
A.
Angles and Saxons from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".They are one ethnic group.
B.
Angles and Saxons were from the Jutland peninsula and they were Germanic groups.
C.
People from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".They are two ethnic groups.
【单选题】I see Mary ______ day in school. I know her very well.
A.
every the second
B.
every second
C.
the every second
D.
the second
【简答题】In the year 1066, the Normans defeated the Anglo-Saxons at the battle of______.
【简答题】Angles, Saxons and______usually known as Anglo-Saxons are the first Englishmen. Language spoken by them is called______, which is the foundation of English language and literature.
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