Analog Electronics
LC oscillators are used for produce a waveform with frequency ranging from

 1MHz to 100 GHz
 1MHz to 500 MHz
 1 KHz to 1 MHz
 100 KHz to 500 MHz

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Analog Electronics
A working diode must have

 Low resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias

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