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Three fractions of the biodiesel(230—260℃,230—310℃ and 260—310℃) were collected by vacuum distillation at an absolute pressure of 2000 Pa.

通过减压蒸馏，在0.002 MPa的压力下，分别收集230~260℃、230~310℃和260~310℃3个馏分段的生物柴油，测定其密度、黏度、冷凝点。

AM may reduce the amount of extractable residues of acenaphthene, however, the extractable fractions account for 65.7%-81.7% of total residues of acenaphthene in soils after 55-day incubation, having a toxic risk to organisms.

AM作用能降低土壤中危可提取态残留含量；但培养55天后土壤中仍有65.7%~81.7%苊属于可提取态残留，对生物有毒害风险。

It was also observed that the effects of oven drying and air-drying on distribution of Cu, Zn and Pb in exchangeable fractions or non-residual fractions were higher compared to the other three treatment methods.

因此，综合考虑重金属的形态分布及其生物可利用性，冻干是较理想的沉积物样品处理与保存方法。

The results were as follows: 1 at normal or high temperature, the selected asphaltene dispersant could reduce the association of asphaltene molecules, 2 hydrogen-transfer of FCC decanted oil and its sub-fractions were evaluated by using anthracene and 9,10-dihydroanthracene as chemical probes, one of sub-fractions could be taken as hydrogen-donor.

本文首先从渣油生焦的关键组分沥青质入手，为热处理降蜡筛选抑制生焦的添加剂，在生焦率低于0.1w%的前提下，提高热裂解降蜡的深度。

In this paper, the simulation four fractions recipe technology was developed based on the initial three fractions proportioning system.

本文阐述了在原有三粒级配料系统的基础上，开发了模拟四粒级炭阳极配方技术。

When he was only 3 years old, Robert knew 1/2 and 1/4 are fractions And fractions.

当罗伯特 3 岁的时候，他就知道 1/2 和 l/4 都是分数分数。

The 1-propanol/biuretium flour protein fractionation procedure based on the differential solubility of wheat flour protein in different aqueous solutions of 1-propanol yields three protein fractions, one monomeric in nature and two polymeric fractions corresponding to soluble glutenin, insoluble glutenin. Quantitative of the fraction was made with improved biuret reaction.

丙醇—双缩脲改良测定法用不同浓度的丙醇溶液将小麦面粉蛋白质分离为功能截然不同的单体蛋白、可溶性谷蛋白和不可溶性谷蛋白三部分，然后通过改良双缩脲测定法对不同组分进行定量分析。

Per the exploration of the fields, we have discovered 7 coal bedrocks, 2 coal fractions located East and 3 coal fractions positioned inside the block.

通过实地勘探，我们发现了七个倾斜煤层，两个在东部的水平煤层和两个在标志之内的水平煤层。

The protein fractions of these feeds and the in situ degradation characteristics of fraction B were determined with three high producing cows fitted with permanent cannulas in rumen, and the degraded ability of these feeds protein fractions were studied.

本论文第二部分主要是利用持续动态人工瘤胃模拟装置，研究了在日粮精粗比、能量和粗蛋白质基本相同的情况下，调整日粮蛋白质组分的水平(RDP/RUP分别为1.73、1.58、1.45和1.33)，对泌乳奶牛瘤胃发酵的影响。

This paper discussed the existing fractions of nickel in natural soil, transformation of nickel fractions in soil and the effect of organic chelators on phytoextraction and biomass.

本文讨论了土壤中镍的存在形态以及有机螯合剂对土壤中镍形态的影响，并从植物吸收Ni的机制出发，阐述有机螯合剂对植物吸收Ni和植物生物量的影响，分析了植物修复的螯合诱导技术的一些局限性，并对植物修复螯合诱导技术提出展望。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。