题目内容
三极管实现放大作用的外部条件是：发射结加_，集电结加__。
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一般情况下，晶体三极管的电流放大系数随温度的增加而__。
In an era of heightened heroism, who are the heroes among us? They can be ordinary people like Daniel Hernandez who ran through danger in a mass shooting to save his boss and Dory Stoddard who saved his wife by _______ her from the hail of bullets
Both of them are ______ heroes as they acted with courage and grace
when __________ extraordinary circumstance.
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