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Water in-flow from drill hole appeared at Main Tunnel round #568 sta. 3+236.5~239.9

Nước ngầm xuất hiện từ lỗ khoan vòng đào #568 Km.  3+236.5~239.9, hầm chính

Tháng 09/2002 - Trở về | Tiếp 

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