驗證網址www.unc.edu安全性

Units: S - The University of North Carolina at Chapel Hill -

S sabin a non-metric unit of sound absorption used in acoustical engineering. One sabin is the sound absorption of one square foot of a perfectly absorbing surface--such as an open window! The sound absorption of a wall or some other surface is the area o...

網址安全性掃描由 google 提供