本文介绍了一般电视塔钢桅杆的安装方法，即整体提升法和整体顶升法。
This paper presents the general installation method of the television tower steel mast, integral elevating method and integral lifting method.
为满足液压轮式通井机的使用要求而设计的桅杆式井架采用板焊结构，主体截面为长方形的方形钢，材料为HG60。
The frame of mast derrick that is designed for hydraulic wheel tractor hoist adopt welding of armor plate, its section is oblong armor plate, and its material is HG60.
帆船主要由船体、桅杆、稳向板或龙骨、舵、帆和索具组成，船体的主要制作材料为木材或玻璃钢。 。 从器材上，运动帆船可分为五大类。
A typical racing sailboat has many parts such as the mast, boom, hull, keel and rudder. Mainly there are five types of racing sailboat. Respectively they are.
应用推荐