Computer Networking
The frequency range : 300 kHz to 3 MHz is used for

FM radio transmission
AM radio transmission
TV transmission
None of these
microwave communications, satellite and radar

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Computer Networking
The packets switching concept was first proposed

in the late 1950s for Defense Ministry of US
in the early 1960s for military communication systems, mainly to handle speech
in the late 1980s for the Defense Ministry of US.
All of these
None of these

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