求翻译：c.吊挂式用螺栓连接方式进行吊杆与龙骨之间的连接。龙骨安装时应将可顶到头的部位确实与墙面、柱面顶紧，固定牢固。龙骨安装从一端向另一端顺序逐条进行，安装各种接插件时应安装牢固，注意吊杆高度，保证标高。是什么意思？

C. bolt hangers on the connection method for hanging and connection between the keel. Keel installation should be the top header of the site does and the wall surface, cylindrical top tight and firmly fixed. Joist from one end to the other end article by article in order for the installation, install various plug-ins should be installed when a solid, note boom height, guaranteed the elevation.