题目内容
_______ is a high-frequency transmission medium that has a single solid-copper core.
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_______ is the name of the process of converting from analog to digital.
_______ uses standard telephone lines to provide high-speed connections.
The range of Wi-Fi networks using microwave connections is being extended over greater distances using a new technology known as _______.
_______ transmits data as pulses of light through tiny tubes of glass.
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