It's shorthand for Radio Frequency. In the electromagnetic spectrum that is associated with the propagation of radio waves.
00:45, 26 November 2012
MSDS: Material safety data sheet (MSDS) is a form ...
A special type of equipment used to control and monitor oil ...
A three phase, four-wire electrical configuration where ...
French standard NF C 61-314 "Plugs and socket-outlets ...
The NEMA 5-15 plug has two flat parallel blades like NEMA ...
This type is mainly used in USA,Canada,Mexico and Japan.The ...
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