粗糙度样板 Glass roughness sample ; [机] roughness sample plate ; Roughness model

粗油样 raw sample

粗花呢样品簿. a book of tweed patterns

表面粗度标准样板 standard speciamen of surface roughness

表面粗糙度比较样块 surface roughness comparison specimen ; Roughness comparison specimens ; comparison specimens for surface roughness

表面粗糙度样块 surface roughness specimens

试印的粗校样 rough pull

粗花呢样品簿 a book of tweed patterns

粗糙度样本 roughness specimen