Three soil characteristics are selected as family classification criteria. They are particle-size class, soil mineralogical type and soil temperature regime.
反映土壤理化性质并影响土壤利用管理的颗粒大小级别、矿物学类型和土壤温度级别是理想的土族分类标准；
There are 40 specifications for YA series, of which the heavy-duty type is used for the classification of large size materials, while the light-duty type is for the middle and small size materials.
本系列振动筛共有四十种规格，其中重型筛供大粒度物料分级、轻型筛供中小粒度物料分级。
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