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

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Computer Basic Information
A large computer designed to handle complex scientific calculations

will likely require a character addressable storage unit
may use only a firmed word-length storage approach
None of these
will not use numbered address locations
must use fixed length words of four character each

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