吊索在吊点处不得有滑移和脱落，个别吊索应连接在被吊装结构的节点上，不得衔接在主弦杆中部和腹杆上。
There shall be no slip and fall off in the sling hanging point, individual sling should be connected in the hoisting structure nodes, no cohesion in the main chord and web members on the middle.
本文根据汽车车架结构的特点，应用薄壁杆系有限单元法，对汽车车架的固有频率和主振型进行了计算。
This paper gave the computer simulation of natural frequencies and vibrational modes of truck frames, based on the structural features of the frame, by finite element method of thin wall rod system.
本实用新型公开了一种主杆可弯折的伞，旨在提供一种结构简单、使用方便的主杆可弯 折的伞。
The utility model discloses an umbrella, the trunk of which could be bended, and aims to provide the umbrella with the bended trunk which is simple in structure and easy to use.
对于下承式钢箱系杆拱桥来说，主梁是结构设计的关键部位。
The steel-box girder of the tie-bar arch-bridge is the key part in the structural design.
对于下承式钢箱系杆拱桥来说，主梁是结构设计的关键部位。
The steel-box girder of the tie-bar arch-bridge is the key part in the structural design.
应用推荐