查询词典 precipitation

Using barium hydroxide octahydrate and urea as raw material,barium carbonate is prepared by homogeneous precipitation method.

以八水氢氧化钡和尿素为原料，采用均相沉淀法制备了碳酸钡粉体。

For comparison, ordinary aqueous precipitation method was used to prepare barium carbonate by using Ba(NO3)2 and NH4HCO3 as the reactants. The influences of adding sequence of the reactants and surfactant et al. on the products were discussed.

此外，以Ba(NO_3)_2与NH_4HCO_3为反应起始物，采用沉淀法研究了制备BaCO_3的影响因素，考察了加料方式、表面活性剂等因素对产物形貌的影响。

The company spirit of "lowest price, best quality, best service" business principles, the industry enjoyed a high reputation at the same time the Company also sells feed-grade ferrous sulfate, trisodium phosphate, barium hydroxide, barium sulfate precipitation and other inorganic products, is the number of brand-name products in central China Chemical Agents.

公司本着"价格最低、质量最好、服务最棒"的经营原则，在业界享有很高的声誉，同时本公司还销售饲料级硫酸亚铁、磷酸三钠、氢氧化钡、沉淀硫酸钡等无机产品，是全国多家名牌化工产品的华中地区代理。

Wind, precipitation, temperature, and barometric pressure changes affect only the surface and shallow subsurface of the Earth.

风、降水量、温度和大气压的改变只会影响地表和地表下的浅层部分。

After analyzing natural factors and human activities, the paper considers the following as main reasons for soil degradation of the source regions of the Yellow River: a natural conditions, climate arid, precipitation decrease, bad soil condition and rich sand source; b human factors, overgrazing, destructive felling, irrational grazing system, wild animals battue, and so on.

在综合分析自然因素和人为活动后，本文认为气候干旱、降水减少、土壤条件差、沙源丰富等自然条件和超载放牧、乱挖滥采、放牧制度不合理、大量捕杀野生动物等人为因素是造成黄河河源区土地退化的主要原因。

Polyketone STCO, a special Ecomaterial, poly (1-oxo-2-phentrimethylene), was prepared by the precipitation copolymerization of CO with ST in the presence of catalysts composed of palladium acetate, bident ligand of 2, 2′-bipyridine, strong acid, p-benzoquinone etc.

利用乙酸钯、含氮双齿配体、强酸、对苯二醌等组成的催化体系催化苯乙烯和一氧化碳的沉淀共聚反应，合成出环境友好材料聚酮STCO—聚（1-氧代-2-苯基丙撑）。

By means of linear trend estimate, Morlet wavelet analysis and binomial coefficient smooth, the interdecadal variation characteristics of north polar vortex and spring precipitation in China are studied.

各季节极涡面积及强度均存在显著的年代际变化，在20世纪70年代中期之前有上升趋势，而后出现下降的趋势；但极涡面积总体上有显著的线性变小趋势。

Systematical variations of silica contents and silicon isotope compo- sitions are observed from their roots to stem to leaves, which provide us reliable evidences for studying the mechanisms of adsorption, transpor- tation and precipitation of silicon in plants, as well as the role of plants in silicon biogeochemical cycle.

由根往茎叶，硅的含量与同位素组成呈规律性变化。为研究植物中硅的吸收、搬运与沉淀机制，探讨植物在硅的生物地球化学循环中的作用提供依据。

The precipitation of biphenyl from twenty organic solvents using carbon dioxide as anti solvent was examined in this study.

本文以二氧化碳作为反溶剂时，探讨联苯在二十种溶剂中沈积的情形。

Based on temperature, precipitation and sunshine time, the suitability degree of meteorological factors in broad bean growing stage were analyzed.

从温度、降水及日照等角度，分析了蚕豆发育期气象条件的适宜度，为作物气候评价的定量化提供参考和依据。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。