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More than 90 percent of the effluents from surface treating is disposed of by chemical methods abroad.
国外对表面处理废水90%以上使用化学法治理。
The results also show the differences of influence between two kinds of surface treating on the initial combustion.
结果还指出了两种表面处理对起始燃烧过程影响的本质区别。
The materials, casting processes and surface treating technique of cast iron piston rings were described in detail.
详细叙述铸铁活塞环的材料、铸造方法和表面处理技术。
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