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已知函数 的定义域为 则 的取值范围是
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【单选题】– How long have you been collecting stamps? – Ever ______ I was twelve. I have been collecting stamps for about eight years.
A.
since                       
B.
before                    
C.
by
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【简答题】I have been working for months to ______ a way of solving this problem，but as yet I have not been successful． 我已经工作了几个月想找出解决问题的方法，但是到目前为止还没有成功。
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【单选题】电路如题26(a)图所示,当输入正弦电压时,输出电压u o 波形出现如题26(b)图所示的形状,若出现的原因是Q 1 静态工作点调整不当造成的,则以下说法正确的是_________。
A.
是饱和失真,应调大R 1
B.
是截止失真,应调小R 1
C.
是饱和失真,应调小R 2 ,
D.
是频率失真,应增大耦合电容。
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【单选题】电路如下图(a)所示,输入电压u1的波形如下图(b)所示,试问指示灯HL的亮暗情况为()。
A.
亮1 s,暗2 s
B.
暗1 s,亮2 s
C.
亮3 s,暗1 s
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【简答题】At that moment, with the crowed watching me, I was not afraid in the ordinary sense, as I __if I___alone. Awould have been...had been Bshould be...had been Ccould be ...were Dmight have been...were
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【单选题】Now I get the telegram I _______.
A.
have been expected to
B.
expected
C.
have been expecting
D.
am expected to
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【单选题】______more time, I might have been abroad to spend my holiday.
A.
I have been given
B.
I were given
C.
Had I been given
D.
Had I given
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【单选题】---How long have you been studying at this school? --- I have been studying here­­­­____.
A.
since I was thir years old
B.
when I was thir
C.
at the age of thir
D.
after I was thir
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【简答题】稳压电路及相关波形如 图所示。读图,回答下列问题: ( 1 )四只二极管构成的电路结构为 式,该部分电路的作用是 。 ( 2 )电容 C 的作用为 ,它的电容量 ( 选 填:较大 / 较小)。 ( 3 )若输入电压 u i 与输出电压 u o 波形分别如图( b )、( c )所示,则开关 S 1 的状态应为 ,开关 S 2 的状态应为 。( 选 填:断开 / 闭合) ( 4 )若输入电压有效值 ...
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【简答题】下图(a)所示是一个反相输入的加法器电路。已知R 11 =R 12 =R f 。如果u i1 ，u i2 的波形如图(b)所示，试画出输出电压u o 的波形。
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相关题目：
【单选题】– How long have you been collecting stamps? – Ever ______ I was twelve. I have been collecting stamps for about eight years.
A.
since                       
B.
before                    
C.
by
查看完整题目与答案
【简答题】I have been working for months to ______ a way of solving this problem，but as yet I have not been successful． 我已经工作了几个月想找出解决问题的方法，但是到目前为止还没有成功。
查看完整题目与答案
【单选题】电路如题26(a)图所示,当输入正弦电压时,输出电压u o 波形出现如题26(b)图所示的形状,若出现的原因是Q 1 静态工作点调整不当造成的,则以下说法正确的是_________。
A.
是饱和失真,应调大R 1
B.
是截止失真,应调小R 1
C.
是饱和失真,应调小R 2 ,
D.
是频率失真,应增大耦合电容。
查看完整题目与答案
【单选题】电路如下图(a)所示,输入电压u1的波形如下图(b)所示,试问指示灯HL的亮暗情况为()。
A.
亮1 s,暗2 s
B.
暗1 s,亮2 s
C.
亮3 s,暗1 s
查看完整题目与答案
【简答题】At that moment, with the crowed watching me, I was not afraid in the ordinary sense, as I __if I___alone. Awould have been...had been Bshould be...had been Ccould be ...were Dmight have been...were
查看完整题目与答案
【单选题】Now I get the telegram I _______.
A.
have been expected to
B.
expected
C.
have been expecting
D.
am expected to
查看完整题目与答案
【单选题】______more time, I might have been abroad to spend my holiday.
A.
I have been given
B.
I were given
C.
Had I been given
D.
Had I given
查看完整题目与答案
【单选题】---How long have you been studying at this school? --- I have been studying here­­­­____.
A.
since I was thir years old
B.
when I was thir
C.
at the age of thir
D.
after I was thir
查看完整题目与答案
【简答题】稳压电路及相关波形如 图所示。读图,回答下列问题: ( 1 )四只二极管构成的电路结构为 式,该部分电路的作用是 。 ( 2 )电容 C 的作用为 ,它的电容量 ( 选 填:较大 / 较小)。 ( 3 )若输入电压 u i 与输出电压 u o 波形分别如图( b )、( c )所示,则开关 S 1 的状态应为 ,开关 S 2 的状态应为 。( 选 填:断开 / 闭合) ( 4 )若输入电压有效值 ...
查看完整题目与答案
【简答题】下图(a)所示是一个反相输入的加法器电路。已知R 11 =R 12 =R f 。如果u i1 ，u i2 的波形如图(b)所示，试画出输出电压u o 的波形。
查看完整题目与答案