... so vi giai on C nhng tng ng vi giai on A Giai on D bao gm: D0; D1; D2 v D3, giai on D0; D1; D2, l giai on chun b cho chu kỡ lt xỏc, cng l nhng giai on quan sỏt thớ nghim Giai on D3 l giai on ... tun mt ln Tụm th lt xỏc cú giai on: giai on tin lt xỏc, giai on hu lt xỏc, giai on trung gian lt xỏc, giai on lt xỏc ( Th Thanh Hng v Nguyn Vn T, 2010) Cỏc giai on ca chu k lt xỏc c phõn bit bi ... tụm 15 g chu kỡ thay t l 11 ngy vi tụm th chõn trng v 12 ngy i tụm sỳ Nhỡn chung, thi gian tng i ca cỏc giai on hỡnh thnh lp v chu k l 5-10% cho giai on A, 9-16% cho giai on B, 12-20% cho giai on...