purity

The students are asked to prove the purity of copper.

要求学生们检验铜的。

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.

白色是洁的象征。

She was a woman of purity and goodness.

她是一位洁善良的妇女。

White is the symbol of purity.

白是洁的象征。

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

摘要利用双氰胺和磷酸反应得到高脒基脲磷酸盐P800。

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

本明获得的胡萝卜素晶体高，胡萝卜素油溶品酸价低、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得为99．99％的氧化钪。

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

灯杯采用高铝极氧化处理，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,制得高苦杏仁苷。

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

向次溴酸钠溶液中滴加适量的丙酮,在四丁基溴化铵催化下,高产率得到四溴化碳。

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酸是制取高学L-胱氨酸的重要措施。

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、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得芦竹碱,经重结晶后其含量为98％。

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，解吸率达97.35%，原花青素达95.

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≥99%的O,O-二乙基硫代磷酰氯。

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.

用乙酰乙酸乙酯法合成了2-庚酮,总得率为58.9%,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.

用高氢和高二氧化钛，在四氯化钛存在下，可以得到高三氧化二钛。