题目内容
负反馈放大电路的级数越多，反馈越深，产生自激振荡的可能性越大。因此实用的负反馈放大电路中以三级最常见。
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若负反馈放大电路产生了自激振荡，则应在电路中的合适位置加小容量电容来消振。
引入不同组态的负反馈对放大电路性能的影响不尽相同。
若柱面的母线平行于某条坐标轴，则柱面方程的特点是_________；
说明：各位同学，由于有同学反映，以前选择题出现音频和部分题目在一个页面，同一音频剩下的题目在第二页面，需要反复翻页的问题，从第四次作业开始，选择题以填空题的形式出现，大家只要把所要选择的项目填写到相应的空上即可，注意区分大小写。如，第一题选择A的，请在该音频下的第一空上填写大写的A，以此类推。Directions:In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report 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).Questions 1 and 2 are based on the news report you have just heard.[音频]1. A) It tries to entertain its audience.B) It tries to look into the distance.C)It wants to catch people’s attention.D) It has got one of its limbs injured.2. A) It was spotted by animal protection officials.B) It was filmed by a local television reporter.C)Its videos were posted on social media.D) Its picture won a photography prize.
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