(ภาษาไทย) ประกวดราคาจ้างก่อสร้างจ้างเหมาดูดตะกอนเลนของสระเก็บน้ำ Swan Lake ด้วยวิธีประกวดราคาอิเล็กทรอนิกส์ (e-bidding)

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