视密度 meaning in Chinese

a arentde ity
apparent density
pseudodensity

Leather - physical and mechanical tests - determination of apparent density
皮革.物理和机械试验.视密度的测定
Cellular material for rubber - plastics shoes - determination of apparent density
橡塑鞋微孔材料视密度试验方法
Micrographics - duplicating film , silver , diazo and vesicular - visual density - specifications and measurement
缩微摄影技术.银盐重氮和微泡复制胶片.视密度.规范和测量