Archinecthttps://archinect.com/forum/thread/150178787/翻译此结果Arhitectural drawing Levels: FFL vs SFL vs SSL SFL refers to the level at the top surface of the floor screeding or concrete topping. While SSL refers to the level at the top surface of the structural slab. Now, when an 更多内容请查看https://archinect.com/forum/thread/150178787/arhitectural-drawing-levels-ffl-vs-sfl-vs-ssl