该机的开发成功不但提高了回收铜的质量，又防止二次污染。
The successful development of the aircraft will not only improve the quality of the recovery of copper, and prevent secondary pollution.
例如为了防止二次污染，即使是排污阀也不采用含石棉的密封填料和垫片。
For example, in order to prevent secondary pollution, even the use of sewage is not Valve asbestos packing and gasket sealing.
化学试剂包显色，样品和试剂用量少，防止并减少了二次污染。
Chemical reagent of Bao Xian color, small sample and reagent consumption, prevent and reduce pollution two.
根据我国目前情况，本文提出了防止和减轻城市垃圾中转过程的二次污染的措施和办法。
Based on the present condition in China, the measures and methods for preventing and relieving secondary pollution in transporting municipal solid wastes are introduced.
本实用新型操作方便快捷，省时省力，并能够有效防止钢水的二次污染，保证钢水的高洁净度。
The utility model is easy and fast to operate and saves time and effort, which can effectively prevent secondary pollution of molten steel to ensure the high cleanness of the molten steel.
本实用新型利用现在国内较为成熟的技术为基础，成本低廉，并有效防止了二次污染，更加安全可靠；
On the basis of the material technology in China, the mineral nutrition drinking water filter device has low cost, and effectively prevents the secondary pollution and is safer and more reliable;
本实用新型利用现在国内较为成熟的技术为基础，成本低廉，并有效防止了二次污染，更加安全可靠；
On the basis of the material technology in China, the mineral nutrition drinking water filter device has low cost, and effectively prevents the secondary pollution and is safer and more reliable;
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