whip-and-derry
简易龙门起重机 economical gantry crane
年最新研发专利 简易起重机。
The latest patent manufactured simple crane.
youdao
桥式起重机可分为普通桥式起重机、简易粱桥式起重机和冶金专用桥式起重机三种。
Bridge crane bridge crane can be divided into ordinary, simple beam bridge crane and metallurgical three special bridge crane.
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