研究动机：胃食道皮瓣可区分为四级。而这种分类系统，可以预测胃食道逆流疾病的发生率。
Objectives: Gastroesophageal flap valve can be divided into a four-grade system and this system can well predict the prevalence of gastroesophageal reflux disease.
净化淀粉采用12-17组旋流器逆流洗涤工艺除去蛋白质和轻杂物，使淀粉标准达到GB2-92一级国家标准。
The starch is purified to Grade I of GB2-92 National Standard by 12~17 groups of vortex machines with reversal flow cleaning process for removal of the protein and impurities.
多级逆流或错流萃取的萃取率明显高于单级萃取。
Both the extraction ratios of countercurrent multi-stage extraction and cross current multi-stage extraction were higher than single-stage extraction.
离心筛和园筛配合使用，采用五级逆流洗涤，生产能力大，浆渣分离彻底。
The centrifugal sieve combined with the circular sieve can thoroughly separate the syrup and the residue by 5-stage reversal flow cleaning.
离心筛和园筛配合使用，采用五级逆流洗涤，生产能力大，浆渣分离彻底。
The centrifugal sieve combined with the circular sieve can thoroughly separate the syrup and the residue by 5-stage reversal flow cleaning.
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