So using additives properly can obtain the better technical and economic effect in substituting the common cements for the special ones to deal with the troublesome zones.

因而合理使用外加剂可以使常用普通水泥在现场处理复杂地层时代替特种水泥，取得良好的技术、经济效益。

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Mobile Personal Computer ( called Notebook PC) research and manufacture is a high technical industry; it brings most social effect and economic benefit because of the portable advantage.

笔记本电脑行业属于高科技产业，因其具有灵活性、简便性及高效性等优点，决定了它的社会效应和经济效益。

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The paper also describes the technical parameter, the performance test, the economic benefit and the using effect in production of the ZHL-75 model hydrocyclone.

文章还叙述了ZHL-75锥形除砂器的技术参数、性能试验、经济效益和生产使用效果。

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