题目内容
The kilo-ohm is the unit of ().
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() are used to tune radios to particular frequencies in the resonant circuits .
() is an electronic component made of semiconductor material.
A small current flowing from the () to the emitter can control a much larger current between the collector and emitter terminals.
When reverse-biased, an ideal () would block all current. A real one lets perhaps 10 microamperes through–not a lot, but still not perfect.
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