TWCBI a«rMyp thyc nghi$m v i d6i chi>ng hi (NDC n=211; NTN n = 105) xtil Kbit 49 Soi tugng Doi chfag NDC (211) Thyc nghigm NTN (105) ?^ Ket qua bing ehotfiiy,dilm sd cuafaaildp: fapc tfadng tfiufag n Ldptfiyengtofm vi ldp ddi cfafag cd sy khfa TAI LigU THAM KHAO i-iT^igtrd r^: ldptfiycngtofm ty If stofa vifa dgt Nguyfa Nhu An (1990), PAwngpA^p %; rpi^H.'™^' sic, gidi, caofaonIdp dli chfag hpc gido dpc hpc tpp 1, DgifapcQuic gia Hi f t r l ^ '^ sinh vifa tfli qua lin ciia ldp fliyc Npi.Tr 172,122 ^ nghifm efag eaofaonldp dli chfag, su kfaic Babanxki lu.K (1981), Tii uu hod qud '_i hift niy cdyngtoaflidngkg d ngufag xie xuit tiinh day Ape Cyc dfa tgo vi boi dufag Bd GD_h P< 0.05 Dieu dd cfafag td pfauong pfaip dgy fapc DT, Hi Npi Tr 75 l | | theo so mi ldptfiycngfaifm dupcfapctgp da Nguyin Ngpc Bio (1996) PAar/«-^„ft'„A " 4^ mang Igi tofu qui honfainso vdi ldp doi chfag tich eifc ttf lpc cua hpc sinh tivng qud tiinh dpy Of^itoh > fu^ d ngufag xfa xuit P < 0.05) hgc tai lifiu bdi duang thuang xuyin cho GV • KfT LUAN ^' thdng trung hpc, Vy GV, Bf GD-DT Hi Qto frtoh fag dyng pfauong pfaip dgy fapc Npi.Tr 118, 191 Mng so mdn LL vi PPGDTC dupe tiln faifa Le Kfaifa Bing (2001), PAirowgpAap rf