Fig.12 illustrates a timber double post roof truss. This type of truss is constructed where a wider span or a less restricted roof space is required. 图12所示为一个双柱(DP)木屋顶桁架。这种桁架主要建于跨度要求较大或屋顶空间限制较少的地方。
Introducing the frequency converter technique that applied into hydraulic drive and control system, a new generation of plastic hollow shaping machine of high-performance and saving energy with single / double working post has been developed. 将变频调速技术引入液压传动及控制系统,研制出新一代高效节能变频式液压单/双工位塑胶中空成型机,并在实践中获得应用。
Application of Double Based Fast Post Processing GPS in Photography Control Surveying 双基准快速后处理GPS技术在航测外业控制测量中的应用研究
Double strands RNA produced post transcriptional gene silencing ( PTGS ) technique is being used to alter the relative proportion of the major fatty acids present in oil plants. 近年来,双链RNA介导的转录后基因沉默技术在油料作物脂肪酸组成的改良方面的研究获得了突破性进展。
There is a distinct difference in the strength characteristic of brittle materials between single impact and double impact or slow compression. And many developing countries face the double impact of industrialization and post industrialization, city's modernization development speeds up, but faces great challenge. 脆性材料单次冲击和二次冲击或低负荷压缩冲击性能方面有很大的差别。城市现代化与新农村建设将成为我国推进城市化健康发展的两大引擎。