Flying - which represents the product groups trusses and trussing, Pipe battens, Air frames, Lighting Bridges.
吊挂-代表了桁架及桁架系统，灯杆，悬挂框架，灯桥。
2
The fourth part Study two kinds of new-type channel mode structure, namely the mode of monopolized shop and trussing up the mode of selling, analyse the structure characteristic of the channel.