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() is not electronic component.

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

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