等级级配  grade proportion

级配变化  gradation differentials

搭配变异  collocation variation

分配变异数  distribution variance

时变变异  time varying mutation

1级配合  Class 1

500kV电压等级变电站  500kV voltage grade substation; kV voltage grade substation

AC-13级配  AC-13gradation

AC-20Ⅰ型级配  AC-20Ⅰ grading

AC-20改进型级配  improved AC-20 grading

AC级配  AC gradation

AK-13A矿料级配  AK-13A mix grade

AP级配  AP size distribution

E等级变换器  class-E converters

RX行星环锥无级变速器  RX planetary tapered stepless transmission

SAC级配  SAC graduation

Superpave级配  Superpave gradation

Superpave级配范围  gradation scope of Superpave

Superpave级配图  grading drawing of Superpave