self-support structure 管子自支承
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。
The authors introduced several supporting structures of tube bundles of tube-shell heat exchangers, especially the new self-support structure.
介绍了管壳式换热器几种管束支承结构的研究进展，并着重介绍了一种新型的管子自支承结构。
Bus bar , zero line bar and protective earth bar adopt the self-designed insulation support, characterized by rational structure and better interchangeability;
母线排、零线排、保护接地排采用自行设计的绝缘支架安装，结构合理，互换性强。
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