TRUONG VAl HOC BAcH KIIOA HA NO] 50 NAM xA Y I)\)NG V A PilAT TR1~N' . ~ -~. -. NGUY~N VAN MAY BdM, QUl).T, MAyNEN (Giao trinh dung cho sinh vien cae tnIong d~i h9C cao ding k9 thu~t ) (In /Un lhtl' ndm) l/i¢u dinh PGS NGUYSN NHlfTHUNG NIIA XIiA-I nAN KIIOA I1