Relaxes the brake, the heavy item then voluntarily fast drops, reduces the return trip time, but this kind of hoisting jack structure is complex.
放松制动器，重物即可自行快速下降，缩短返程时间，但这种千斤顶构造较复杂。
Jack ma likes the way li approaches One Foundation as a business: _spending time designing its structure and systems, and trying to make it transparent.
马云赞同李连杰把壹基金作为企业的做法：构想企业的结构和系统，尝试将其透明化。
As an example of the application, the changing structure of the diameter of an even-aged Jack pine stand is simulated and forecasted.
作为应用实例，对一块小叶松林分直径结构的变化进行了动态模拟和预测。
By analyzing the structure of upright post and hydraulic jack, this essay introduces the structure of a rational and practical upright post or hydraulic jack, which also can be repaired easily.
前言：通过对立柱、千斤顶的结构进行对比、分析，介绍了合理、实用并便于检修的立柱、千斤顶应具有的结构。
The ordinary screw jack depending on the thread self-locking action support heavy item, the structure is simple, but the transmission efficiency is low, the return trip is slow.
普通螺旋千斤顶靠螺纹自锁作用支持重物，构造简单，但传动效率低，返程慢。
Uses the fission style structure, high frequency connection with jack on is used between the shaken-board and the ultrasonic generator, useful and maintains conveniently.
采用分体式结构，震板与超声波发生器之间采用带插座的高频连接，使用及保养均方便。
This paper discusses the two structure forms of cantilevers of jack-up drilling platforms, and the type selection of news jack-up drilling platforms in our country.
主要阐述了自升式钻井平台悬臂梁的两种结构形式特点，以及目前我国新建自升式钻井平台的选型目标。
The invention has the advantages of a double locking structure by use of the plug, the jack and the movable button, high safety and simple structure and is not easy to be lost.
本发明的有益效果在于：采用插头与插孔和活动扣的双重扣紧结构，安全性高，结构简单，不易丢失。
The invention has the advantages of a double locking structure by use of the plug, the jack and the movable button, high safety and simple structure and is not easy to be lost.
本发明的有益效果在于：采用插头与插孔和活动扣的双重扣紧结构，安全性高，结构简单，不易丢失。
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