表面不平度 meaning in English

surface distortion
surface irregularity

Guidance of the limits of surface irregularities of ferrite cores - rm - cores
铁氧体磁芯表面不平度极限值导则. rm -磁芯
Wide - mouth glass containers - deviation from flatness of top sealing surface - test methods
广口玻璃容器.顶部密封表面不平度.试验方法
Guidance on the limits of surface irregularities of ferrite cores - part 2 : rm - cores
铁氧体磁芯表面不平度极限值的导则.第2部分: rm -磁芯
Guidance on the limits of surface irregularities of ferrite cores - part 2 : rm - cores iec 60424 - 2 : 1997 ; german version en 60424 - 2 : 1997
铁氧体磁芯表面不平度极限值的导则.第2部分: rm -磁芯