The complex surface active agents with success applied in chemical cleaning of dowthem scales in heating casing of ball valve in PTA plant was presented.

采用复合表面活性剂对PTA装置球阀加热夹套热媒垢成功地进行了化学清洗。

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Combined chemical flooding agent is composed of surface active agent, polymer and alkali.

化学复合驱的驱剂主要是表面活性剂、聚合物和碱。

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The surface active properties of the sulfated alkanolamides were determined thoroughly and the relationship between chemical structures and properties were investigated.

测定了文题化合物的克拉夫特点、钙皂分散力、发泡力以及去污力等表面活性，研究了它们的结构与表面活性之间的关系。

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And it's believed that the high chemical reactivity of the surface is due to the deposition of chemically active gases from the atmosphere onto the surface, gases like hydrogen peroxide and ozone.

NPR: Revisiting the Viking Missions to Mars