Plan for selecting contractor contractor repair projects of the bridges of km35+103; Khuoi Tau Bridge Km46+938; Ban Cam bridge KM51+579 and repairing the four -hats of Pac Nghe Km44+837 bridge on NH.279; Repairing expansion slots of the bridges Km40+730; Na Pushing Bridge Km46+950 on NH.3C route; Repair of expansion slot Deng Km78+230; Ta Po bridge Km85+030, Black Bridge Km143+070 on NH.3B route; Supplementing the examination of bridges on NH.3B routes, QL.3C and QL.279, Bac Kan province