The paper introduces isothermal quenching technology of spherical cast iron and its mechanical properties after quenching. Through comparision,it comes that the isothermal quenching is one of the best among the heattreatment techmologies,and gives some practices for examples.
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Moreover, through comparision of the planar K-joints, the load bearing capacity ratio of multiplanar KK-joint and planar K-joint is also obtained.
另外，通过与平面K型节点对比，得出空间节点与平面节点承载力的比值。
The paper studied how pre-tension affect single-strand breaking strength, through a series of comparision experiment of different pre-tension.
文章通过一组不同的预加张力的比对试验，探讨预加张力对单纱断裂强力的影响。
Through the comparision between the blank and the sulfur dioxide standard solution, the way to make the sulfur dioxide quality control map is pointed out in the analysis of sulfur dioxide.
通过对全程序空白与已知浓度二氧化硫标准溶液的对照分析，提出了大气二氧化硫分析中质控图的做法。
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