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【多选题】
集成运放的加法运算电路，有哪几种类型？A.
反相加法运算电路
B.
比例运算电路
C.
同相加法运算电路
D.
减法运算电路
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反馈参考答案：
举一反三
【单选题】It was midnight and he was tired because he ________since dawn.
A.
was working
B.
has worked
C.
had been working
D.
has been working
【简答题】Rewrite the following sentence from the you-viewpoint. We have shipped the Dove desk set you ordered on May 3.
【简答题】假死猪的急救方法: 、 、 、 。
【单选题】We have shipped the replacement for all the items you have found______.
A.
unsatisfactory
B.
satisfactory
C.
satisfy
D.
satisfying
【单选题】It was midnight and Lisa was tired because she _________ since dawn.
A.
was working
B.
had been working
C.
has worked
D.
has been working
【单选题】we have shipped the replacement for all the items you have found______.
A.
unsatisfactory
B.
satisfactory
C.
satisfy
D.
satisfying
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