/images/1041385860215607387/1230701802622554228/dung-khoa-hoc-ky-thuat-den-tu-chan-quyen-2-chuong-42-hop-ly-phan-phoi.txt?ex=6634475f&is=6621d25f&hm=c135904c1fffebf16821618a2570925d1ba595696a3ea17a4b35f6437eef64e3&