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【单选题】
听力原文：M: What did you think of Professor Brown's lecture? W: The topic was interesting, but the lecture was much more difficult to follow than I had expected. What does the woman say about the lecture?A.
It was a long lecture but easy to understand.
B.
It was so difficult as she had expected.
C.
It was not as easy as she had thought.
D.
It was interesting and easy to follow.
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【简答题】现测得放大电路中两只管子两个电极的电流如 图 所示。则图a的晶体管为 型, 电流放大系数 β为: 。图b的晶体管为 型, 电流放大系数 β 为: 。
【单选题】现测得放大电路中晶体管两个电极的电流如图1.7所示。求另一电极的电流和管子的类型。
A.
0.99mA；PNP型
B.
0.99mA；NPN型
C.
1.01mA；PNP型
D.
1.01mA；NPN型
【简答题】现测得放大电路中某晶体管的两个电极的电流情况如题45图所示。则该晶体管的电流放大系数β为 ,该晶体管类型为 (填PNP/NPN)。
【单选题】已知晶体管的电流放大系数 β 为 100 ,现测得放大电路中这只管子两个电极的电流如图所示。 则另一电极( )。
A.
为集电极，电流方向往外
B.
为基极，电流方向朝里
C.
为发射极，电流方向往外
D.
为控制极，电流方向朝里
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A.
并列复句
B.
取舍复句
C.
目的复句
D.
选择复句
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