KEEL - main structuraltube that runs along sail at center chord of wing.
龙骨—沿翼帆中心弦延伸的那根主结构管。
2
The layers are affixed to a steel tubestructural frame.
这些幕墙层被粘在具有结构作用的铁管状框架上。
3
Based on this, the interrelations between the elastic coefficient and the structural parameters of the nanospring, such as tube diameter, spring diameter and coil pitch, are carefully studied.