题目内容

既然晶体三极管由两个PN结组成，能否用两个背靠背的二极管组成一个晶体三极管呢？

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为什么晶体三极管工作在放大区时，发射结正向偏置、集电结反向偏置呢？

为什么晶体三极管工作在饱和区时，基极电流对集电极电流控制能力弱呢？

习题：Please listen to Yale President's address, take notes where necessary and fill the blanks of the following paragraphs with the missing words.Standing here today I'm feeling many of the the same _(1)_ that President Brewster must have felt in 1970. In his speech, he gave voice to a question that was probably on the minds of many, a question I also pose to you today: "Where then is the purpose, which makes _(2)_ supportable, when the world is on fire?"Today, again, it seems like the world is on fire. The United States is in the midst of its greatest _(3)_ since 9/11. We are fighting a global pandemic. This summer, we have witnessed terrible wildfires, drought and _(4)_ in many corners of the globe. These are complex challenges that call out for urgent and concerted action.Your college years are a time to develop your _(5)_ and talents, to challenge yourself in ways you did not think possible, to gain knowledge and understanding, and to _(6)_.Improving yourself means leaving your _(7)_ zone, signing up for classes that sound interesting, but _(8)_. Going to office hours with slightly intimidating _(9)_, you may be surprised by the conversation that unfolds. Attending talks by speakers whose views are different than yours, and really listening to their _(10)_.

an incorrect or unsuitable name