In this article,the current railway box-girder bridge erecting machines at bome and abroad are briefly introduced and analyzed,the research & design situation o
Based on some experts' research effort, the problems of land subsidence and relative sea level rise in three Chinese delta areas(Huanghe, Changjiang and Zhu
It is introduced in this paper that a high strength and high toughness X70 pipeline steel with an ultra-low acicular ferrite microstructure has been researched