用抓斗的普通门式起重机工作级别较高。
QB型防爆吊钩桥式起重机工作级别为中级。
QB type explosion-proof hook bridge crane work level is intermediate.
桅杆起重机工作时会受到多种因素的作用，其安全性受到广泛关注。
Mast crane is subject to the interference of diversified factors when it is running, and its security has attracted extensive attention.
目的研究塔式起重机工程载荷状态，提供评估塔式起重机疲劳寿命的依据。
To evaluate the fatigue life of tower crane, research the load status of tower crane.
最近她独自回到东莞在一个起重机工厂里找了份工作，暂时与她村里的丈夫和孩子分居两地。
She recently returned to Dongguan on her own to take a job in a factory that makes construction cranes, temporarily leaving her husband and children back in the village.
本文通过对液压随车起重机各臂在工作中的运动分析，指出了影响起重机工作的因素，探讨了液压随车起重机结构设计的方法。
This paper points out the factors affecting the crane and explores the structural design of the hydraulic truck crane by analyzing the movements of the arms of the crane during its work.
本文通过对液压随车起重机各臂在工作中的运动分析，指出了影响起重机工作的因素，探讨了液压随车起重机结构设计的方法。
This paper points out the factors affecting the crane and explores the structural design of the hydraulic truck crane by analyzing the movements of the arms of the crane during its work.
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