硫酸

The abrasion, sulphuric acid and cold stratification treatments significantly promoted overall germinability.

磨砺、硫酸浸泡和冷藏处理对种子萌发有明显的促进作用。

In fact, as early as 200 years before, Le'Blanc process for manufacture of soda ash was to produce Na2CO3 accompanied with sulphuric acid by Glauber's salt.

事实上，早在200多年前的路布兰制碱法就是用硫酸钠制得纯碱并副产硫酸。

In recent years, chemical industry in Jiangsu Hongze southerly, Meishan, Sichuan, Hunan Hengyang such as Glauber's salt resource-rich areas, the acquisition of a large number of Glauber's salt mining rights, the anhydrous sodium sulfate southerly annual chemical sales of about 1.6 million tons, for the world and domestic market share has reached 70%; barium sulfate annual sales of about 40,000 tons for the first in the country.

近年南风化工在江苏洪泽、四川眉山、湖南衡阳等芒硝资源丰富地区，收购了大量芒硝矿的开采权，南风化工的无水硫酸钠年产销量约为160万吨，为世界第一，国内市场占有率已达70%；硫酸钡年产销量约4万吨，为全国第一。

Glucosamine sulfate is considered the more effective of the two.

葡萄糖硫酸认定是更为有效的两个。

The two other commonly used forms of glucosamine on the market are glucosamine sulfate and glucosamine hydrochloride.

其他两种常用形式的葡萄糖对市场是硫酸葡萄糖胺和氨基葡萄糖盐酸盐。

The effect of different reaction conditions,such as catalyst concentration,molar ratio of reactants,reaction temperature,reaction time,on the coupling reaction of trioxane and methyl formate synthesizing methyl glycolate and methyl methoxy acetate using sulfuric acid as catalyst has been studied.Through the analysis for the yield of products and system pressure,and comparison with other different acidity catalysts,we considered that the activation of formaldehyde was the control step of reaction rate to the...

以硫酸为催化剂，研究了三聚甲醛与甲酸甲酯偶联合成乙醇酸甲酯和甲氧基乙酸甲酯的反应中，催化剂浓度、原料配比、反应温度、反应时间等条件对反应过程的影响，通过对产物收率和系统压力变化的分析，并结合与其它不同酸强度催化剂的对比，得到甲醛的活化是偶联反应的速率控制步骤，催化剂的酸强度决定其对甲醛的活化能力，是影响偶联反应的主要因素。

Our company's business is mainly producing all kinds of caustic alkali including sheet and granulose and solid alkali which have the different contents, and also producing pure-alkali, calcium chloride and magnesium sulfate and so on.

我公司主营烧碱业务，生产各种含量的片状、粒状及固体烧碱。另外有纯碱、氯化钙、硫酸镁等产品。

Based on the colour reaction of copper with sulfocyanate and crystal violet, a new spectrphotometric method for determination of copper in the presence of β-cyclodextrin and arabic gum is proposed. The factors such as acidity, reagent dosage, influence of surfactant and coexisting ions on the reaction were discussed and the optimal conditions were investigated.

研究了在β-环糊精和阿拉伯树胶存在下，在硫酸介质中，硫氰酸盐－结晶紫与铜的显色反应，建立了光度法测定铜的新方法；讨论了酸度、显色剂用量、表面活性剂和共存离子的影响，确定了最佳实验条件。

In this paper, the catalyst which consists of different concentration of H_2SO_4, HAc and the liquid Lewis acid, which was used to catalyze Blanc chloromethylation.

本文报道了一种由液体Lewis酸与不同浓度的硫酸和醋酸所组成的新型芳烃氯甲基化催化剂体系。

Hemihydrate can be used instead of gypsum.

半水物硫酸钙可以用来代替石膏。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷