7 7 7 7 7 7 7 =10
كيف ذلك???????????????
7 7 7 7 7 7 7 =10
كيف ذلك???????????????
Fluorinated ethylene propylene valve
FEP of chemical industry valve is a copolymer of hexafluoropropylene and tetrafluoroethylene. It differs from the PTFE (polytetrafluoroethylene) resins in that it is melt-processible using conventional injection molding and screw extrusion techniques. Fluorinated ethylene propylene which is used chemcial industry valve was invented by DuPont and is sold under the brandname Teflon-FEP.
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الجواب كالاتي :
( 7/7 ) + (7/7 )+(7/7)+7 =
1 + 1+1+7 = 10
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