Another important consideration when specifying commercial wood floors is Janka ratings. Janka ratings rank the relative hardness of wood species used in flooring applications. The Janka rating is ...

杨卡硬度（英语：Janka hardness test）以奥地利出生的美国研究员Gabriel Janka命名，用以描述木材的硬度。常用标准为ASTM D1037。 迈氏硬度（英语：Meyer hardness test）以Eugene Meyer命名。 H = P max A p {\displaystyle ...

Welcome to the UK's Official Charts! In addition to the Official Singles and Albums Chart, did you know the Official Charts Company compiles 50+ charts every week, spanning different genres and ...

The UK’s biggest Afrobeats songs of the week based on sales and streams across a seven day period, compiled by the Official Charts Company.

After hours: October 21 at 7:59 PM EDT ...

After hours: October 21 at 7:59 PM EDT ...