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。
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。
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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