KEEL - main structural tube 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。
The layers are affixed to a steel tube structural frame.
这些幕墙层被粘在具有结构作用的铁管状框架上。
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.
在此基础上，分析了单层碳纳米弹簧的弹性常数与弹簧结构参数（如管直径、弹簧直径、簧圈节距等）间的关系；
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