Quảng Ninh nghiên cứu xây đường hầm ngầm ở cửa ngõ vịnh Hạ Long
Tỉnh Quảng Ninh đang nghiên cứu và khẩn trương hoàn thiện dự án đầu tư đường hầm ngầm dưới nước dài hơn 1,3km ở cửa ngõ vịnh Hạ Long (thuộc Cửa Lục, thành phố Hạ Long) ...
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Theo TTXVN