皮皮学，免费搜题
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【单选题】
正反馈多用于()。A.
改善放大器的性能
B.
产生震荡
C.
提高输出电压
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】What will the man do this afternoon?
A.
He has an important meeting.
B.
He has a lunch appointment.
C.
He will check his schedule for openings.
D.
He will write a report.
【单选题】What do we know about the man from the conversation?
A.
He has never been to the beach.
B.
He is hard-working.
C.
He has never spent his weekend in the library.
D.
He wishes he had gone to the beach with the woman.
【简答题】A．No, he is not allowed to change his mind. B．Yes, he has the legal right to do so. C．No, because he has already displayed the goods. D．Yes, if the customer allows him to do so.
【单选题】— Do you think he can get the first prize for jumping? —Impossible now. He to do so, but he has just hurt his leg. [ ]
A.
would expect
B.
was expected
C.
has expected
D.
is expected
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