1. 平面度：平、立、仰三个焊接位置downhand (downward), vertical and overhead positions. | 平面度planeness | 平焊downhand position welding

2. 平度：plane-table survey 平板测 | planeness 平度 | planet 行星

3. planeness

3. 平直度：plane 轮坡 | planeness 平直度 | planepolarizedlight 平面偏光

4. planeness的近义词

4. 平整度：planeness 平面度 | planeness 平整度 | planer cutting tool 刨床切削工具

1. the property of having two dimensions

    Synonym: two-dimensionalityflatness