The paper introduces welding technology of type ZY6400/12.5/28 hydraulic support, from several respects of selecting materials preheat before welding, welding process and so on.
从焊接材料的选用，焊前预热、焊接过程和焊后热处理的控制几个方面，着重介绍了ZY6400/12.5/28型液压支架的焊接工艺。
This Paper mainly introduced hoe to satisfy forestry economical duration by reasonably selecting logging ways and technology type.
阐述了森林采伐中如何通过采伐方式和工艺类型的合理选择、采伐量的合理确定，来满足林业经济的持续性。
This Paper mainly introduced hoe to satisfy forestry economical duration by reasonably selecting logging ways and technology type.
阐述了森林采伐中如何通过采伐方式和工艺类型的合理选择、采伐量的合理确定，来满足林业经济的持续性。
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