Previously, the earliest indications of oxygen had been from between 2.3 billion and 2.4 billion years ago when the "Great Oxidation Event" occurred.
之前认为，氧气最早出现的迹象是在2.3亿到2.4亿年前之前，那时侯正经历着“大氧化事件”
It is shown that light and water quality have great effect on the oxidation, especially the latter.
结果表明，水质和光照条件对该氧化反应均有较大影响，且水质的影响尤为显著。
In organic chemistry, the oxidation of benzyl halides and benzyl alcohols to aromatic aldehydes and aromatic ketones is an important reaction and of great significance both in theory and in practice.
在有机化学中，将苄卤和苄醇氧化成芳醛或芳酮是一类非常重要的反应。
So, how to improve the IR anti-reflection and anti-oxidation of CVD diamond has been of great interest.
因此，CVD金刚石的红外增透、抗氧化就成为大家关注的焦点。
This technology holds great practical values in raising the bath temperature for hard anodic oxidation of aluminium, improving the film hardness and energy saving etc.
该工艺在提高铝硬质阳极氧化槽液温度、增加膜的硬度和节能等方面都县有很大的实用价值。
This technology holds great practical values in raising the bath temperature for hard anodic oxidation of aluminium, improving t…
该工艺在提高铝硬质阳极氧化槽液温度、增加膜的硬度和节能等方面都县有很大的实用价值。
These results further testified that there were great differences of the substrates, products and the course of reaction in the enzymatic oxidation and non-enzymatic oxidation.
进一步证实了酶促氧化与非酶促氧化下，聚合反应的底物、产物及反应过程存在差异。
The results show that there exist great differences in surface morphology, oxidation species and flotation behavior of galena ground with ceramic or iron media.
结果表明，采用瓷介质与铁介质磨矿时，方铅矿表面形态、表面氧化产物及浮选行为存在明显差异。
The following results are of great importance: (1) the oxidation power of roots in wide—space planting keeps a reasonable level (lower by 17.5%—36.1% per gram fresh weight).
尤以以下三方面的结果更具有意义。 （1） 水稻每克鲜根的氧化力低于对照17.5%—36.1%。
By means of consulting a great deal of literature, the authors found that dichromatic oxidation titration method fits for the determination of organic matter in semi-organic fertilizers.
测定肥料和土壤中有机质的方法有多种，通过文献查阅发现，用重铬酸钾滴定法测定有机-无机复混肥中的有机质是可行的。
The benefits are very great:- process turnaround is improved, re-blows are avoided, as is undesirable oxidation of the metal (ref 5).
好处是非常明显的：过程控制得到改善，避免回炉，否则将会产生金属氧化。
The temperature has great effects on the oxidation of molten AZ91 alloy.
另外，熔体温度对该合金的氧化也有影响。
As a new development of mild coal cleaning, the desulfurization and deashing of coal by electrochemical oxidation of coal water slurry has received an increasing great interest abroad.
作为一种煤的温和化化学净化，煤的电化学法脱灰脱硫近期在国外引起广泛关注。
Oxidation methods are treatment techniques of the phenol wastewater with a great developable future.
氧化法是一类极具发展前途的含酚废水处理技术。
Searching for a kind of thermoacidophilic bacterium that can bear high temperature while maintaining strong iron sulfur oxidation ability is of great significance to biological metallurgy.
寻求能耐受较高温度，又能保持较强铁氧化性和硫氧化性的嗜热嗜酸菌对生物冶金具有重要的现实意义。
Micro-arc oxidation power supply is the key equipment of micro-arc oxidation process, the study of micro-arc oxidation power supply has the great significance of micro-arc oxidation technology.
微弧氧化电源是微弧氧化工艺的关键设备，对微弧氧化电源进行研究对微弧氧化技术的进步具有重要意义。
CO2 is a final oxidation product of organics. How to transform it into useful chemical resource is a great challenge to us.
二氧化碳是有机物氧化的最终产物，如何将其转化为有用的化工资源，十分重要。
The strong cathodic reaction of chalcopyrite is of great importance to the oxidation-leaching of chalcopyrite.
黄铜矿的阴极反应较强烈，且对黄铜矿氧化浸出具有重要意义。
The strong cathodic reaction of chalcopyrite is of great importance to the oxidation-leaching of chalcopyrite.
黄铜矿的阴极反应较强烈，且对黄铜矿氧化浸出具有重要意义。
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