The principle of grading is comparing the inspected tobacco leaf with the standard tobacco leaves.
其基本原理是，建立标准样本烟叶的特征数据库，将待测烟叶与样本烟叶比较而进行分级。
Due to the structure and working principle, make the uniqueness of spin vibration sieve especially suitable for small particles and the subtle powder material of grading.
由于结构和工作原理的独特性，使得旋振筛特别适用于对小颗粒和微细粉物料的分级处理。
Spiral classifier with different proportion of solid particles in the liquid precipitation rate of different principle, to wash the mixture of ore, grading.
螺旋分级机借助固体颗粒的比重不同而在液体中沉淀的速度不同的原理，对矿石混合物进行洗净、分级。
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