To synthesize aryl pyrimidines by taking benzene, methyl benzene ,acetic ether,1,2-dichloroethane as solvent,the yield and purity of the product are high by taking methyl benzene as solvent.

分別選用苯、甲苯在免费jIzzjIzz在线视频网址、乙酸乙酯自拍偷拍2018、二氯乙烷作為溶劑合成桂皮酰哌啶，結(jié)果表明甲苯作為溶劑時產(chǎn)品純度高AV-级福利黑白配久久，收率高国产一极免费在线视频，可用于大規(guī)模生產(chǎn)。

The conductivity and the molar conductivity of the ionic liquid in actone, water, DMF, acetic acid were investigated at different temperatures.

利用磷酸三丁酯與N-甲基咪唑在恒溫150℃下一步合成了離子液體1-丁基－3-甲基咪唑磷酸二丁酯黄片mmm播放，考察了其在丙酮欧美日韩精品久久久久久，水，DMF人人摸人人干，乙酸溶劑中的電導(dǎo)率及摩爾電導(dǎo)率97人人操网站。

This research also indicated that (1) amount of total phenolic compounds, total flavones and percent of DPPH scavenging activity can be used as discriminate index for different kinds of vinegars,(2) new antioxidant may be formed during acetic acid fermentation period and decoction period, and be worth further researching.

本論文實(shí)驗還表明：(1)總酚含量、總黃酮含量99r视频国产在线观看免费、DPPH自由基清除活性可作為不同種食醋的鑒別指標(biāo)之一人人操V潮；(2)食醋釀造醋酸發(fā)酵階段和煎煮過程中可能會生成一些新的具有抗氧化性的成分，可能值得進(jìn)一步研究。

Nine kinds of vinegars and an acetic acid resolution were measured by the gas sensors array which were composed of ten doped nano-ZnO thick film sensors.

利用由10個摻雜納米氧化鋅厚膜氣敏傳感器組成的陣列對9種食醋和乙酸溶液進(jìn)行了測量av毛片对白。

This paper reported the materials doped with oaminobenzoic acid in the silica gels which were prepared by solgel process from the water glass used acetic ether as a latent acidic reagent.

有機(jī)發(fā)光體以其較高的發(fā)光效率视频在线观看欧美、快速響應(yīng)能力和較寬的可調(diào)諧波長被廣泛應(yīng)用于光轉(zhuǎn)換材料、非線性光學(xué)材料和激光材料[1-3]jizzjizz日本在线。

Objective To establish HPLC-UV method for determination of glycyrrhizin acid in compound nasal spray of glycyrrhizin and flower flos magnoliae,the chief active ingredient of formulation,glycyrrhizin acid,and to observethe therapeutic effect of this formulation on guinea pig's hypersensitive rhinitis.Methods A compound nasal spray formulation was prepared using extracts of glycyrrhizin and measured by HPLC-UV method.Mobile phase conˉsisted of methanol,0.2mol/L ammonium acetate and glacial acetic acid（67:33:1,v/v）,analytical column was Zorbax ODS C 18 and wavelength250nm.

目的 建立測定復(fù)方甘草和辛夷噴霧劑含量的方法并觀察該制劑對豚鼠超敏性鼻炎的療效方法以甘草提取的甘草甜素和辛夷花蒸餾提取液主藥制備成鼻用噴霧劑WWW.AV天堂2017，用反相高效液相色譜法測定制劑中甘草酸含量精品视频小说图片在线观看，檢測波長為250nm欧美指交视频在线观看，Zorbax ODS C 18 分析柱，流動相為甲醇：0.2mol/L醋酸銨：冰醋酸（67：33：1）黄片视频吗。

In order to research and evaluate the safety of food packaging of plasticizer Di-2-ethylhexyl phthalatein PVC film, the migration rate of DEHP from PVC film into water food simulants (distilled water, 65% aqueous ethanol, 20% aqueous ethanol, 4% aqueous acetic acid) was studied at 17, 30, 40, 50 and 60℃ by Gas Chromatography.

為了研究評判PVC膜中增塑劑鄰苯二甲酸二異辛酯在食品包裝中的安全性a无码毛片免费视频，采用氣相色譜儀測試了幾種水性溶劑（蒸餾水、65%乙醇欧美激情黑人、20%乙醇aa美国一级性爱片、4%乙酸）在不同溫度（17℃、30℃毛片直播在线、40℃欧美精品极品高清免费、50℃、60℃）下對PVC膜中增塑劑DEHP的溶出率久久久久99。

Then, the prepared PET flakes were immerged into four kinds of food simulants (including n-hexane, 15% ethyl alcohol, 3% acetic acid and water).

而后91足交在线，分別用4種食品模擬液（正己烷、15%乙醇天堂大秀一级黄片、3%醋酸和蒸餾水）浸泡制備好的PET薄片欧美激情性爱视频小说。

The results show that DEHP can migrate into all water food simulants from PVC film and the migration rate was the highest in 65% aqueous ethanol with the range 0.85%～6.31% and a big increasing amplitude when contacting temperature over 30℃, the rate was lower in 20% aqueous ethanol and distilled water with the range 0.19%～0.45% and 0.19%～0.37%, respectively; and the rate was the lowest in 4% aqueous acetic acid with the picked out rate 17% and the value ＜0.4%.

研究結(jié)果表明，PVC膜中DEHP在幾種水性溶劑中均有溶出一级av无码，在65%乙醇中溶出率最大海外黄色视频，范圍為0.85%～6.31%，當(dāng)浸泡溫度超出30℃后国产尤物视频一区，溶出率增幅較大视频一区二区公开；在20%乙醇和蒸餾水中的溶出率較小，范圍為0.19%～0.45%和0.19%～0.37%黄色毛片日韩无码；4%乙酸對DEHP的溶出作用最小黄片一区二区三区，70個樣品中，檢出率為17%18网站黄色入口，檢出溶出率日韩一级啪啪。4%。

The effects of the content of acetic acid or water in mobile phase, temperature, sample loading and flow rate on the separation were systematically investigated. The fast enantioseparation of these two racemates on monolithic columns were successfully realized.

考察了流動相中添加不同濃度的醋酸和水最新进精品视频一区二区三区瑟色、溫度3P视屏、進(jìn)樣量以及流速對分離的影響，在這兩種整體柱上實(shí)現(xiàn)了對其消旋體的快速分離。