题目内容

() is not electronic component.

A. vacuum tube
B. integrated circuit
C. silicon
D. transistor

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The kilo-ohm is the unit of ().

A. weight
B. resistance
C. capacitance
D. inductance

() are used to tune radios to particular frequencies in the resonant circuits .

A. resistor
B. transformer
C. capacitor
D. inductor

() is an electronic component made of semiconductor material.

A. resistor
B. transformer
C. PN junction
D. transistor

A small current flowing from the () to the emitter can control a much larger current between the collector and emitter terminals.

A. base
B. gate
C. P type semiconductor
D. N type semiconductor