Imagination and Practice on the Extra Tall(ET) Building Surveying in Airfield Height Control Region 机场控高区域超高建筑物测量设想与实践
The tower of the extra high voltage ( EHV ) transmission line is heavy, tall, and it has longer cross arm and complex structure. 特高(ET)压线路的铁塔重量大、铁塔高、横担长、结构复杂。