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【简答题】
负反馈放大电路的四种基本类型是 、 、 、 。
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反馈参考答案：
举一反三
【简答题】A．失血性贫血 B．营养性缺铁性贫血 C．营养性巨幼红细胞性贫血 D．单纯小细胞性贫血 E．营养性混合性贫血 小细胞低色素性贫血为
【单选题】It took them_______ to finish the work yesterday.
A.
sometimes
B.
sometime
C.
some time
D.
some times
【单选题】He took some medicine and felt better, but he still could not leave the bed.
A.
greatly
B.
slightly
C.
magically
D.
strongly
【单选题】Rolf took part in many contests,______were at an international level.
A.
some of them
B.
some of it
C.
a few of them
D.
a few of which
【单选题】由同一个或相邻两个调度区段中几个车站所装的货车组成,通过一个及其以上编组站不进行改编的列车称为()。
A.
始发直达列车
B.
基地直达列车
C.
阶梯直达列车
D.
技术直达列车
【单选题】He waited______before he took revenge.
A.
sometimes
B.
some times
C.
some time
D.
sometime
【简答题】A．再生障碍性贫血 B．小细胞贫血 C．巨幼红细胞性贫血 D．恶性贫血 E．β-型地中海贫血
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