分级法 meaning in English

grading method
stage method
staging

The application of evaluating grade in thoracolumbar burst fracture
评分分级法在胸腰椎爆裂骨折中的应用
Method of visual classification for muscovite mica blocks , thins and films
白云母块薄片及薄膜的目视分级法
Classification or grading method
归类或分级法
Particle size analysis ; size analysis by air classification ; fundamentals
粒度分析.用空气分级法进行粒度分析.原理
Modulation of spinnable polycarbosilane with a high melting point via fractional precipitation
沉淀分级法调制纺丝级高熔点聚碳硅烷

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