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.
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