特点：
特别适用于在有限的空间内使用，例如狭窄的人行道和走廊；
能轻松自如地在楼梯和其它扶手梯上搭设；
单宽式的设计，可以推着穿过一般的门；
轻便，但不失稳固；
易于携带，可拆下来放进小型货车装运。
Characteristics:
It is designed for use in confined spaces such as narrow alleyways and corridors.
It is allowed to be erected on escalators and stairways.
It can be rolled through standard doors.
It is light convenient and firm.
It can be put into the van for transportation.
