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【单选题】
一般要求放大电路的输出电阻A.
小些好，输入电阻大些好
B.
大些好，输入电阻小些好
C.
和输入电阻都大些好
D.
和输入电阻都小些好
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举一反三
【简答题】A frog (青蛙) is born in a small river．When he is young，the river is his home．He doesn’t know his parents，but he has hundreds of brothers and sisters．He swims about and plays with them all the time．At t...
【单选题】Yesterday my teacher was off sick, because he had a frog in his throat. What does the underlined part mean?
A.
He tried to eat a big frog.
B.
It is difficult for him to speak because of a sore throat.
C.
He was frightened by a frog.
D.
The frog is hard to swallow.
【简答题】中国第一部动画长片是由万氏兄弟绘制的
【简答题】阅读理解。 A frog (青蛙) is born in a small river. When he is young, the river is his home. He doesn't know his parents, but he has hundreds of brothers and sisters. He swims about and plays with them all th...
【单选题】In the sentence as “He ketched a frog one day, and took him home, and said he cal’lated to educate him; and so he never done nothing for three months but set in his back-yard and learn that frog to ju...
A.
instruct
B.
find out
C.
come to see
D.
guess
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