题目内容
要减小输出电阻,应引入并联负反馈 。
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电流负反馈都能稳定输出电流,减少输出电阻。
要提高输入电阻或减小放大电路向信号源索取的电流,应引入串联负反馈。
Section CDirections: In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.[音频]Question 16
Question 17
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