粗糙度比 meaning in English

roughness ratio

Roughness comparison specimens - specification for turned , ground , bored , milled , shaped and planed specimens
表面粗糙度比对试样.第1部分:车磨镗铣成形和刨削试样规范
Roughness comparison specimens - specification for spark - eroded , shot - blasted , grit - blasted , and polished specimens
表面粗糙度比对试样.第2部分:电火花加工喷丸处理喷砂处理及抛光试样规范