Computer Basic Information
The essential difference between an operating system like Linux and one like Windows is that

Linux is proprietary, whereas Windows is not.
any programmer can modify Linux code, which is not permitted with Windows.
Windows can run with an Intel processor, whereas Linux cannot.
there are multiple versions of Linux, but only one version of Windows.
None of these

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Computer Basic Information
In MODEMS

All of these
None of these
Digital signal is amplified
A digital signal changes some characteristic of a carrier wave
Several digital signals are multiplexed

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