特殊用法absolute roughness1.绝对粗糙度channel roughness1.河床糙度combustion roughness1.燃烧强度dynamic roughness1.动力糙度sand roughness1.砂粒粗糙性surface roughness1.表面粗(糙)度, 表面光洁度wall roughness1.壁面粗糙度roughness of engine1.发动机运转不稳