| 释义 |
crown block短语¹¹⁴⁴⁶⁷⁺⁴
基本例句
定滑轮
The text detailedly introduced crown block, running system, availability work period of bridge girder erection equipment and improve case for precast beams install.
详细介绍了对双导梁式架桥机天车、行走系统、有效工作长度及预制梁安装就位的改进情况。 cnki
The derrick man, positioned at the crown block, is to advise the driller when the snake is coming through the crown sheave.
井架工看守在天车上，当蛇皮接绳器到达天车时，通知司钻。 blog.sina.com.cn
To replace the drilling line wrapped around the crown block and traveling block.
为更换缠绕在天车和游动滑车周围的钻井钢丝绳用。 www.infopetro.com.cn |