man be shedat be madareki rajeb be tarahi yek farayand ehtiaj daram,mesl mass & energy balance,pfd,etelaat eghtesadi,....
baraie dars tarh o eghtesad bayad peroje bedim,
khodam ham mitoonam too tarahi be shoma komamk konam faghat mikham avalesh az tajrobe digaran estefade konam
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