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【单选题】
汽车电子电路中使用有多种振荡电路，关于振荡电路的说法，正确的是（）。A.
具有足够负反馈量的放大器就可构成振荡器
B.
RC振荡电路属于非正弦波振荡电路
C.
LC电路可用于信号选频电路
D.
当电容增大时，LC振荡器的频率随之变大
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【单选题】A common assumption about the private sector of education is that it caters only to the elite. 【C1】______ , recent research points in the opposite direction. If we want to help some of most【C2】______ ...
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【简答题】洛必达法则求极限
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A.
In addition
B.
On the contrary
C.
In effect
D.
In general
【单选题】A common assumption about the private sector in education is that it caters only to the elite. (1)_____, recent research points in the opposite direction. If we want to help some of most (2)_____ grou...
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On the contrary
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【单选题】The people in that remote area still live on humble means because the economy there is underdeveloped.
A.
difficult
B.
modest
C.
arduous
D.
domestic
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