The students are asked to prove the purity of copper.

要求学生们检验铜的纯度。

The silver vase had been hallmarked at Birmingham.

这个银瓶是在伯明翰打上纯度标记的。

The high purity amidinothiourea phosphate (P800) was reacted with the dicyanodiamide and phosphoric acid.

摘要利用双氰胺和磷酸反应得到高纯度脒基脲磷酸盐P800。

Results Pure flavonol and flavanonol were obtained by the column chromatography of polyamide.

结果运用聚酰胺柱色谱法一次分离得高纯度黄与二氢黄。

We can guarantee it pure.

们可以保证它的纯度。

The purity 99.99% of scandium oxide(Sc 2O 3) was prepared from tungstenic slag with extraction process.

用萃取法从钨矿渣制得纯度为99．99％的氧化钪。

The main products of PET supercritical methanolysis are dimethyl terephthalate(DMT) and ethylene glycol(EG).

红外光谱检测解聚产物是纯度很高的对苯二甲酸二甲酯（DMT）单体和二。

The 2,6 dipicrylamino 3,5 dinitro pyridine(PYX)pureness reference material had been certificated by potentiometric method.

用电位滴定法对2，6-双（苦氨基）-3，5-二硝基吡啶（PYX）标准物的纯度进行测定。

Its advantages include high purity of carotin crystal, low acidity of the oil solution of carotin and stable quality.

本发明获得的胡萝卜素晶体纯度高，胡萝卜素油溶品酸价、稳定。

Dichlorofluorobenzene is prepared by diazotizating of 2,4-dichloro aniline and substituting of 2,4-dichloro diazo benzene with fluorinion.

在此概述了由2,4-二氯苯胺经过重氮化、置换制得2,4-二氯氟苯的生产新工艺,产品纯度达到99。

Therefore,it is important to control strictly reaction conditions for removing cystine's mesoisomer and making L-cystine of high optical purity.

严格控制反应条件，分离除去内消旋胱氨酸是制取高光学纯度L-胱氨酸的重要措施。

This paper texted the process to prepare metadoxine from vitamine B6 hydrochloric acid salt ,pyroglutamic acid and isoproanol.

本文以维生素B6氯化氢盐、焦谷氨酸和异丙为原料,固相合成美他多辛,纯度达96.3%。

Heptanone with purity being 98.5% was synthesized by ethyl acetoacetate.The yield is 58.9%,and its application in the related fields were discussed.

用酰酸酯法合成了2-庚,总得率为58.9%,纯度为98.5%.介绍了2-庚在相关领域中的应用.

The mixture was refined by sodium sulfide and sodium hydroxide to afford an O,O-diethyl thiophosphoryl chloride at a purity of 99%.

该粗品通过精制工艺的改进,采用硫化钠和氢氧化钠的混合物进行处理,得到纯度≥99%的O,O-二基硫代磷酰氯。

The results showed that the purity of Zincite as product was more than 99.6%in according with the requirements of grade A products.

试验结果表明,其产品氧化锌纯度可达99.6%以上,符合一级品的要求。

Recent method of synthesizing 3,5-xylenol is sulpho alkaline fusion of dimethylbenzene,it is a very complicated procedure with serious pollution and low-pure products.

国内目前生产工艺是间二甲苯的磺化碱熔法,该方法工艺过程复杂、污染严重,并且产品纯度不高。

Through the simple method of CTAB, total DNA of velvetleaf was extracted from sprouts of velvetleaf in which there was a little secondary metabolites.

本研究利用黄等次生代谢物未大合成的青麻幼芽为材料，采用简化CTAB法提取青麻总DNA，可以获得高纯度、高产的DNA。

The improvement of the purity of fluorene is not dependent on the removal of acenaphthene and dibenzofuran, but dependent on the separation of other impurities.

芴纯度的提高主要不是依赖苊、氧芴的去除,而是其它杂的分离。

Etodolac was synthesized with 7-ethyltryptophol and methyl 3-oxopentanoate as the starting materials.Highly pure etodolac was obtained by purifying the crude product with a mixing solvent.

以7-基色和3-氧代戊酸甲酯为起始原料,以甲为溶剂,合成了依托度酸.采用混合溶剂对粗品进行精制,得到了高纯度的依托度酸.

They are the silent spectators of prakrti (matter or nature), which is composed of three gunas (dispositions): satva, rajas and tamas (steadiness, activity and dullness).

它们是帕克提（物或自然）的无声观众，是由三重的根拿斯（部署）组成：萨特瓦，拉杰斯和塔玛斯（坚定性，活跃性和纯度）。