齿轮轮齿接触印痕
gear tooth contact pattern
复合轮齿齿轮副
complex wheel teeth gear set
小齿轮轮齿啮合
pinion gear tooth contact
小齿轮轮齿啮合型式
pinion tooth contact pattern
采油油轮油气分离装置
offshore oil tanker oil-gas separator
90级齿轮油基础液
grade90gear oil bodying agent
摆线齿轮油液压马达
cycloid gear hydraulic motor