Through further dissolving the crude levo-serine or dextro serine product in deionized water through heating, decolorizing, hot filtering, concentrating filtrate, adding anhydrous alcohol, lowering the temperature to about 10 deg.c, stirring and stilling, filtering and stoving, levo-serine or dextro serine product is obtained.
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Spam identification and filtering is one of the hot issues.
垃圾邮件的识别与过滤是目前研究的热点问题之一。
These system include filtering system for crude oil entering, filtering and cooling system for hot oil, filtering and cooling water circulating system for reduction gearbox of the drilling motor.
该系统包括原油入口的过滤装置，热油过滤冷却装置和钻井马达变速箱过滤冷却循环装置等三大部分。
Information Filtering technology is a hot issue on the studying of information technology.
信息过滤技术已是当今信息技术研究的热点。
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