Bidding For The Purchase Of 3 Items Of Hydraulic Cement, Bag Cement, 50 Kg./Bag, And Other Items For Repair Work Of The Large Left Bank Water Canal. Phra Prong Reservoir, Km. 4+500 To Km. 5+500, Chong Kum Subdistrict, Watthana Nakhon District Sa Kaeo Province By Means Of Electronic Bidding