最普通的也是最实用的，使用GTC-A型液压升降机，登高作业也许不再是烦恼。 GTC-A single-ladder stop type It is most common but also most practical. By using GTC-Amodel hydraulic elevator, working in the air is no more a trouble for operators. GTC-A型单梯防转式 GTC-A single-ladder stop type
