The line-shape of catwalk of long-span suspension bridge is obtained by using the segmental catenary method to carry out......

The line-shape of catwalk of long-span suspension bridge is obtained by using the segmental catenary method to carry out......

全液压自动钻具输运系统是全液压驱动,用于将地面钻具输运到钻井平台的自动化装置.着重介绍了该系统的结构特点、主要技术参数、动......