【单选题】We __ friends since ten years ago.
【判断题】NPN型三极管,若测得VBE>0, VBE
【单选题】We have been friends since
【单选题】— How do you like your Chinese teacher? — He is great. We friends since three years ago.
【单选题】正在工作中的NPN型三极管,若测得UBE=0.65V,UCB=-0.6V,则三极管可能工作在:
【单选题】Since then,we friends.