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( ) (4)Heinich, Robert and Russal, Jame D. Instructional Media :
the New Technologies of Instruction. New York: John Wiley&Sons
Inc.,1982.
(5)http://www.elecnet.chandra.ac.th/tipntrick/stepper/index.html(6)http://www.kmitnb.ac.th/mte/motor/index.html
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