purity

The students are asked to prove the purity of copper.

要求学生们检验铜的纯度。

Probity and purity will command respect everywhere.

为人正派到处受人尊敬。

The white colour is a symbol of purity.

白色是纯洁的象征。

She was a woman of purity and goodness.

她是一位纯洁善良的妇女。

White is the symbol of purity.

白是纯洁的象征。

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

摘要利用双氰胺和反应到高纯度脒基盐P800。

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

发的胡萝卜素晶体纯度高，胡萝卜素油溶品价低、质量稳定。

Deoxygenate was used to remove the remanent oxygen from gas for supplying the high purity gas.

脱氧剂用于脱除气体中的微量氧气以提供含氧量极微的高纯气体。

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纯度为99．99％的氧化钪。

The lamp cup is made from Germany-original anodic alumian of high purity, featuring long life and durability.

灯杯采用高纯铝雾面阳极氧化处理，永久耐用。

Ultrafine zircon powder with high purity is a kind of brightening agent in glaze for making high-grade cleaning whiteware.

高纯超细锆英石粉是制造高档卫生洁具陶瓷所用釉料中的乳浊增白剂。

High purity amygdalin was obtained from apricot kernel by the process of enzyme destruction, defatting, solvents extraction and recrystallization.

苦杏仁经灭酶、脱脂、萃取、重结晶,制高纯苦杏仁苷。

Carbon tetrabromide was prepared from acetone and sodium hypobromite by adding tetrabutylammonium bromide.The yield and purity were very satisfactory.

向次溴钠溶液中滴加适量的丙酮,在四丁基溴化铵催化下,高产率到四溴化碳。

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是制取高光学纯度L-胱氨的重要措施。

Use in the dark color: standard color is adopted terse white, which possesses qualities of austerity, bluffness and purity.

深色环境中的应用：的标准色采用简洁的白色，朴素、坦率、纯正是白色的特性。

Thus, Gramine was prepared from Indole by condensatallizafion, the purity of Gramine was 98% , and the yield was 95% .

报道了芦竹碱新的合成方法,由吲哚与甲醛和二甲胺缩合而制芦竹碱,经重结晶后其含量为98％。

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,到纯度≥99%的O,O-二乙基硫代酰氯。

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.

用乙酰乙乙酯法合成了2-庚酮,总率为58.9%,纯度为98.5%.介绍了2-庚酮在相关领域中的应用.

High purity titanium sesquioxide was obtained by the reaction of high purity hydrogen and titanium dioxide in the presence of titanium tetrachloride.

用高纯氢和高纯二氧化钛，在四氯化钛存在下，可以到高纯三氧化二钛。

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,其产品氧化锌纯度可达99.6%以上,符合一级品的要求。