随着信息技术的飞速发展,作为数字地球的重要支撑技术之一的元数据技术显得越来越重要。空间元数据描述了地理信息中空间数据集的......

More and more applications of ZnO arrester in electrical system experienced more problems. One thing, that is still unde......

Rhynchanthus beesianus W. W. Smith (Zingiberaceae) is an epiphytic tropical ginger with a very conspicuous floral displa......