题目内容
共集电极放大电路有如下特点；（）。
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单管共集电极放大电路中，若输入电压为正弦波，用示波器观察vo和vi的波形，则vo和vi的相位相差180o。
Q: What did Irina Bokowa, the Director-general of UNESCO say about women scientists?A: The world needs science, while science needs ___________________. It's impossible to make any progress for ____________________ if one sets aside the other half's ______________, _____________, and ____________.
Q: What are Xie Yi's contributions to science?A: She is part of a team who created a new ______________________ that can be used to convert ____________ or ____________ into electricity. Her work contributes to __________________ pollution and _______________ energy efficiency.
Q: Who selected this year's (2015) five laureates?A: An independent international __________ made up of 12 _____________ scientists and researchers.
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