Report - ß“π·≈–æ≈—ßß“π - mPECmpec.sc.mahidol.ac.th/pho/lnotes/lesson_wrk_enrgy.pdf · ªî¬æß… å ‘∑∏ ‘§ß ¿“§« ‘™“ø î‘° å §≥–« ‘∑¬“»“

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