The R f value of the glucosamine sulfate was 0.36 measured by paper chromatography with the solvent system of pyridine, ethyl acetate, water and glacial acetic acid (5∶5∶3∶1 in volume).

經(jīng)紙層析鑒定超碰人人免费人妻，以吡啶首页国产欧美日韩丝袜、乙酸乙酯亚洲欧美综合精品二区、水和冰醋酸按體積比 5∶5∶3∶1組成的溶劑系統(tǒng)進(jìn)行展層欧美特级黄色，氨基葡萄糖硫酸鹽的Rf 值為 0 chao碰。36性欧美lx╳lx╳。

The Rf value of the glucosamine sulfate was 0.36 measured by paper chromatography with the solvent system of pyridine, ethyl acetate, water and glacial acetic acid (5:5:3:1 in volume).

經(jīng)紙層析鑒定，以吡啶、乙酸乙酯www.欧洲视频在线、水和冰醋酸按體積比5：5：3：l組成的溶劑系統(tǒng)進(jìn)行展層欧美性爱片网站，氨基葡萄糖硫酸鹽的Rf值為0.36。

Under the conditions of 456 W power output and l0min irradiation time, the quantities of reactants are malonic acid 13.Og and vanillin lOg, in pyridine solvent (1 6m1), the yield of reaction is 80%.

本實(shí)驗(yàn)在額定功率為456W国产羞羞涩涩午夜视频，輻射時(shí)間為10min下亚洲性爱区第一页，反應(yīng)物投料量分別為丙二酸13.6g，香蘭素10g在16ml溶劑中進(jìn)行反應(yīng)人看看人人摸人人操。

Red sun of the Group of paraquat, the herbicide, and other chlorpyrifos products as raw materials need to pyridine.

的紅太陽(yáng)集團(tuán)的百草枯人人看人人看，除草劑，毒死蜱等為原料的產(chǎn)品需要吡啶99久久国产一级特片无码。

A method for the determination of antimony potassium tartrate with precon- centration of polyvinyl pyridine chemically modified electrod by using graphite furnace AAS is described.

本文研究了聚乙烯吡啶化學(xué)修飾電極預(yù)富集——石墨爐原子吸收法測(cè)定酒石酸銻鉀的方法在线观看免费黄色网站。

The IR sp ectra of adsorbed pyridine showed that most of the acid sites on the surface of the catalyst are Lewis acid sites.

吸附吡啶的紅外光譜證明該催化劑的表面酸點(diǎn)多為L(zhǎng)ewis酸點(diǎn)。