本文根据往复振动筛筛选分级的要求及特点，建立了往复振动筛运动参数优化设计的数学模型。
According to requirements for grading and characteristics, this paper presents the mathematical model of optimum movement parameter designing for vibrating screens.
广泛应用于矿山、建筑、交通、能源、化工等行业的产品筛选和分级。
Widely used in mining, building material, transportation, energy, chemical industry product selection and classification.
研制出来的汉字大纲应立足于“字本位”教学理念，“由字到词”进行字种的筛选和分级。
The improved the outline of the Graded Chinese character should base on the teaching ideas of "character orientation" and select and classify word species "from character to word".
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