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.
结果运用酰胺柱色谱法一次分离得高纯度黄酮醇与二氢黄酮醇。
We can guarantee it pure.
我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).
红外光谱检产物是纯度很高的对苯二酸二酯（DMT）单体和乙二醇。
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-（基）-3，5-二硝基吡啶（PYX）标准物质的纯度进行定。
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低、质量稳定。
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，分离除去内消旋胱酸是制取高光学纯度L-胱酸的重要措施。
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、焦谷酸和异丙醇为原料,固相合成美他多辛,纯度达96.3%。
Contents: 100% Pure Organic Papaya Extract Powder, Papaya Extracts, Natural Papaya Ferment, Papaya Prolease, Renieratene, Buttermilk Extracts.
100%高纯度有机木瓜精粉、木瓜萃取液、天然木瓜酵素、木瓜蛋白酶、胡萝卜素、优酪乳萃取物。
The carbothermic method of preparation for titanium diboride with titanium oxide and boron oxide in an arc furnace is studied.
研究了电弧炉碳热还原氧化钛和氧化硼制取二硼化钛的方法，制备出相对纯度大于95％的二硼化钛。
Desorption ratio attained 97.35% and the purity of procyanidins was 95.25% when the concentration of ethal was 40% as elution solvent.
以40％乙醇溶液洗脱，吸率达97.35%，原花青素纯度达95.
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.
用乙酰乙酸乙酯法合成了2-庚酮,总得率为58.9%,纯度为98.5%.介绍了2-庚酮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-二乙基硫代磷酰氯。
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.
本研究利用黄酮等次生代谢物未大量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、高产量的DNA。
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The uranium is only enriched to about 3.5%. It cannot be used for a bomb.
浓缩铀的只有3.5%左右。这一不能用来制造炸弹。
This technique guarantees the purity of the silk.
这种技术能保证丝的。
Bottled water companies often brag about the purity of their drinks.
瓶装水公司通常会夸耀自家水的。
A hunk of pure iron, for example, doesn't tend to stay pure for very long.
例如，一大块铁不能长时间保持它的。
Weapons grade uranium is 90%. Bethany Bell reports.
武器级浓缩铀的为 90%。贝瑟妮·贝尔报道。
In June, we gave you the dope, it tests 100 percent pure.
六月把毒品你的时，还是百分之百。
For Iran to build a nuclear weapon it would need a stockpile of uranium enriched to weapons-grade purity.
伊朗将需要铀浓缩储备来制造高武器。
This is the gold as it comes out of the ground, and it's unusually pure as gold goes.
刚出土的金矿就是这样，异乎寻常的高金矿。
It didn't really matter what shape the metal was, just how much it weighed and how pure it was.
形状并不要紧，重要的是重量和。
A government could guarantee a coin's purity by stamping their official seal on a lump of metal.
政府可以通过在一块金属上盖上官方印章来保证硬币的。
The stamps on them are the guarantee of the weight and the purity.
货币上的印记便是重量及的保证。
First, he was unable to find a procedure to make penicillin pure enough to work as a medince.
第一，他无法找到一种方式使青霉素达到药物的。
Uranium enriched at 60 percent purity is just a step away from weapons-grade levels of 90 percent.
达到60%的浓缩铀距离武器级别的90%只有一步之遥。
In reports seen by the BBC, the agency said the particles were enriched up to 83.7 % purity.
在BBC看到的报道中，该机构表示，这些颗粒物的高达83.7%。
This is a silica that the pineapple plant processes on its own, and it is of very high purity.
“这是菠萝自己加工而成的二氧化硅，非常高。”
The stopping of the stockpiling of Iran's 20 percent-enriched uranium — its most sensitive fuel — that's gone.
伊朗已经停止20%的浓缩铀的储备工作，这是其最为敏感的燃料。
The Lydians hit on the idea of the state, or the king, issuing standard weights and standard purity.
吕底亚人选择让国家或国王来确定重量与标准。
The reprocessing opens pure amounts of uranium and plutonium, both of which could be used to make nuclear bombs.
因为再加工过程会产生高的铀和钚，两种物质都可用于制造核弹。
A powder packed in a glass tube was offered for sale on the Yahoo auction site as uranium 99.9%.
一些装在玻璃试管中的粉末曾在雅虎拍卖网站上架，标注为99.9%的铀。
Capture this vapor, cool it down, and what's left is liquid alcohol much more concentrated than any fermented beverage.
将挥发的气体收集起来，并冷却，便能得到比任何发酵饮料高很多的液体酒精。
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详细解释
氰胺和磷酸反应得到高
酰胺柱色谱法一次分离得高
酸二
基）-3，5-二硝基吡啶（PYX）标准物质的
把毒品
你的时
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