It's shorthand for Radio Frequency. In the electromagnetic spectrum that is associated with the propagation of radio waves.
00:45, 26 November 2012
The plugs have three round pins arranged in a triangle, ...
A tiny capacitor that can fit inside a cell phone battery ...
is an innovative gadget that generates electricity ...
A three phase connection where each phase is connected in ...
A dangerous condition in which contact or equipment failure ...
French standard NF C 61-314 "Plugs and socket-outlets ...
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