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【单选题】
Before she left on the trip, she（）hard.A.
had trained;
B.
has trained
C.
would trained
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【简答题】Determine the working mode of each transistor. (a)and (c) is silicon material, (b) is germanium material.
【单选题】Which of the following best describes a transistor?
A.
a cable that transmits bits by means of light pulses along a glass or plastic fiber instead of electrical signals over a conductor
B.
an electronic device that can accept, manipulate, store, and output data, and whose instructions can be programmed
C.
an older information system that remains in use because it still functions and is costly to replace
D.
a small electrical circuit made from a semiconductor material such as silicon
【单选题】The transistor works in the amplifying state. The measurement results are shown in the figure. If the transistor is made of the material of 锗 ,|VB-VE|=0.3V. If the transistor is made of the material...
A.
PNP锗,NPN硅
B.
NPN锗,PNP硅
【单选题】The transistor works in the amplifying state. The measurement results are shown in the figure. If the transistor is made of the material of 锗 , |VB-VE|=0.3V. If the transistor is made of the materia...
A.
PNP硅, NPN锗
B.
NPN硅,PNP锗
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