Effects of the change of chemical content on welding processing property is observed in the same welding condition by changing the content of different element in the flux core.
保持药芯中合金成分不变，改变药芯填料不同组分的含量，在相同的焊接条件下，观察了药芯组分含量变化对焊接工艺性能的影响。
In this thesis, we study the chemical element content change in suspension, solution and sediment state when in low, high and normal flow season.
研究化学元素在枯、丰、平三个水季悬浮态、 可溶态、 沉积态的含量变化。
A continuous extraction method was adopted to analyze the chemical forms of arsenic (as) in soil, and the content change of as with different forms were compared when the additives were added.
采用连续提取法对土壤中砷的化学形态进行分析研究，比较加入不同改良剂时砷的各种形态含量的变化。
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