The surface density of galaxies in a cluster can be measured from photographs . 一個星系團中星系的表面密度可從其照片上測得。
Textiles . tests for fabrics . method for the determination of the surface density 紡織品.織物試驗.表面密度的測定方法
. aluminium and aluminium alloys - anodizing - determination of mass per unit area surface density of anodic oxidation coatings - gravimetric method 鋁和鋁合金.陽極氧化.陽極氧化涂層單位面積
Their antistatic performances were determined using methods of electrification voltage by friction and surface density of charge 采用摩擦起電電壓法和電荷面密度法,對其進(jìn)行了抗靜電性能測試。
. en 12373 - 2 aluminium and aluminium alloys . anodizing . part 2 : determination of mass per unit area surface density of anodic oxidation coatings . gravimetric method 鋁和鋁合金.陽極化.第2部分:陽極氧化物層單位面積質(zhì)量的測定