A、population inversion
B、flat band
C、strong inversion
D、. pinch off
A、voltage dependent K+ channel.
B、voltage dependent Na+ channel.
C、voltage dependent Ca2+ channel
D、Ach receptor cation channel.
E、chemical dependent Na+ channel.
A、voltage series feedback
B、voltage shunt feedback
C、current series feedback
D、current shunt feedback
Under difference-mode operation, the difference-mode voltage gain for this circuit is ().
A、0.0397
B、80
C、40
D、0.08
A、a 180° phase shift
B、an output voltage slightly greater than the input voltage
C、the emitter connected to dc ground potential
D、None of the above
Producing a thermogram is ______.
A.expensive because of the high voltage the machine requires
B.a time-consuming process
C.inexpensive after the machine is purchased
D.an unsafe procedure
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