双重壁管弯曲，以保护跨管间距。

Dual wall tube bending to protect inter-tubular spacing.

youdao

本实用新型给出的是一种可以调节人体与阅读文件间距和高度及对眼睛有保护作用的多功能保健阅读架。

The utility model relates to a multifunction health reading rack, which can regulate the distance and the height between human bodies and reading files and have the protective action for eyes.

youdao

介绍了在采用液化石油气低温常压储存方案时，对低温储罐及其基础、保护系统和储罐的布置、间距及防火堤的设计要求。

Introduces the design requirements on low pressure storage tank and its foundation, protective system, layout, space and fire dike of the tank...

youdao