Thin space: A type spacingpiece equal to one-fifth of an em.
薄空铅：相等于正方五分之一的活字间隔材料。
2
A spacingpiece is arranged at the portion close to the back of the installation rod, and the outer edge of the spacingpiece leans against the chassis outside the through-hole.
在安装条上靠近后端的部位设置限位片，该限位片的外边缘倚靠在通孔外的底座上。
3
The quantity and the length of embedded splice bar shall meet the design requirements and the related construction code. And the spacing tolerance of splice bar is not bigger than a piece of brick.