The nonlinear dynamic stability of transmission tower is a hot topic in theoretic research, but it is exiguous in China.
输电铁塔结构的非线性动力稳定问题，是理论研究领域内一个前沿课题，目前在国内少有研究。
The utility model can get over small steps and gap obstacles on ground surface and sweep exiguous garbage.
能越过地面小的台阶和缝隙障碍，清扫细 小的垃圾。
The utility model can get over small steps and gap obstacles on ground surface and sweep exiguous garbage.
能越过地面小的台阶和缝隙障碍，清扫细 小的垃圾。
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