The extensive pin-boards play a key role in the widespread acoustic treatment, applied to walls, floors and ceilings, which is essential in blended learning spaces.
大量插件板用于墙壁、地板和天花板，在广泛的声学处理中发挥关键作用，这是混合学习空间里必不可少的。
2
The performance of blended thick and thin polyester filament (BTTPF) before and after alkali treatment and the effect of the additive on it were discussed emphatically.