车轮高度基准系统
wheel elevation reference assembly
光度基准
primary photometric standard
photometric primary standard
基准基床系数
Reference Coefficients of Subgrade Reaction
理论深度基准面
lowest normal low water
lowest normal low water LNLW
theoretical bathymetrical datum
漫透射视觉密度基准装置
a primary standard facility of diffuse visual transmission density
内陆航行图深度基准面
chart datum for inland navigation