求翻译：QUY80履带起重机是在徐工重型多年的履带吊生产经验的基础上，为满足市场需求，完善履带吊产品系列而设计的产品。该产品起重性能优越，可带载行驶，360°全回转作业，伸缩式履带。主臂长13～58m，固定副臂长9～18m。是什么意思？

QUY80 crawler crane crawler crane is in Xuzhou heavy for many years on the basis of experience, to meet the market demand, perfect crawler crane product series designed products. The product superior lifting performance, load, 360 ° rotating job, telescopic crawler. Boom length 13~58m, fixed jib length 9~18m.