A kind of structure design of lightweight of primary mirror is introduced in this paper.
介绍了主反射镜的一种轻量化结构设计；
The character of lightweight steel structure portal frame was introduced.
对门式刚架轻型钢结构的组成特点进行了简单介绍。
Vertical structure, small, lightweight design.
立式结构，体积小，重量轻的设计。
Vertical structure, small, lightweight design.
立式结构，体积小，重量轻的设计。
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