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salam doste aziz man nemitonam filehayeh marbot be encyclopedya of science and technology ro extract konam misheh rahnamaiim koni hamash eror mideh

salam mam daneshjoieh mekanin hastam porojam dar mored polymer hast mikhastam bebinam ketaby hast ke grade hayeh mokhtalef polymerha va khavaseshon ro dashteh basheh ye jor handbook mikham ke data hayeh lazem ro dashteh basheh. mamnon misham maileton bedin ageh mitonin komaky konin in mail me...