The results provide the theoretical basis to the study and application of top and bottom angle steel connection joint. 这些研究结果对顶底角钢连接节点的研究和应用提供了一定的理论基础。
It's welded by the steel pipe and angle steel, the two pieces of steel pipes can act as the guiding track for the suspension coop. 用无缝钢管和角钢焊接而成，其底边的两根钢管兼做吊笼的导轨。
