Ninu ikole opo gigun ti gigun, pẹlu awọn laini irin ṣe iṣiro ipin nla, labẹ awọn ipo deede, 35% si 40% ti awọn idoko-owo paipu laini ṣe iṣiro lapapọ idoko-owo iṣẹ akanṣe.Bii o ṣe le yan idiyele ti o ni oye, iṣẹ pipe ti paipu jẹ pataki paapaa, rea…
Ka siwaju