Air classification can be used to separate a flour into fractions with different ratios of protein to starch.

气力分级可用来将面粉分成不同蛋白质一淀粉比率的级分。

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The problems in controlling upper size and lower size of feed into an air solid fluidized bed were discussed, and then an air classification technology of moist raw coal was introduced.

讨论了空气重介流化床分选对入料粒度上下限的控制方法和存在问题，介绍了潮湿原煤空气分级新方法。

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Using clustering analysis method on the classification of Chinas urban air quality levels, gather into the city air quality in most similar category, analysis of causes, concluded.

运用聚类分析方法对我国城市空气质量等级进行分类，把空气质量状况最相似的城市聚成一类，分析原因、得出结论。

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These vehicles' front passenger airbags may not deploy in the event of a crash because of a possible problem with their occupant classification system, which gauges the size of a passenger and based on that whether an air bag should be deployed.

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