Xinhua: China is to employ BeiDou satellite-based augmentation system in railway survey China will employ BeiDou satellite-based augmentation system (BDSBAS) to provide high-precision positioning service in railway survey and construction. 1w 02-20 17:24 READ MOST 我国授权纳米专利总数达46.4万件 居世界第一 8361 08-30 21:46 POPULAR TAGS 纳米 中科院 专利
