The flotation and filtration test of Ximing coal were studied by using 7 kinds of PAM as additives.

采用7种型号的聚丙烯酰胺作为添加剂，对西铭煤进行了浮选和过滤试验。

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Experts say China has lengthy and strict procedures to test whether ingredient are safe to use as additives.

专家称，中国检测作为食品添加剂的成分是否安全还有一个漫长和严格的过程。

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Lignin derivatives can be used as additives to drilling mud, plugging agents, mobility control agents and sacrificial agents in surfactant flooding.

木质素的衍生物可作为泥浆处理剂、堵水剂、调剖剂、增粘剂、表面活性剂驱油的牺牲剂。

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French government scientists found that Mr Mas' implants contained the chemicals baysilone, silopren and rhodorsil - normally used as fuel additives or in the manufacture of industrial rubber tubing.

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However, these modified celluloses require large amounts of petroleum-based additives such as plasticizers, which results in bioplastics with a low plant component ratio and poor durability, including heat resistance and water resistance.

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All meals are prepared in a normal manner -- without any additives, such as vitamins.

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