objective to determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of edaravone, by gas chromatography.methods sample solution was injected on a gdx column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.the residue was calculated by the external standard method.results the linearity was good over the range of 25 μg/ml～400 μg/ml,with the correlation coefficient of acetone being 0.996 and the average recovery 96.8%.conclusions the method was proved to be simple,rapid,practical and highly sensitive.it is an efficient method for the quality control of acetoacetic ester.

摘要］ 目的：用氣相色譜法測定依達拉奉合成起始原料乙酰乙酸乙酯中丙酮的殘留量曰韩性交业余。方法：采用固定相為二乙烯苯乙基乙烯苯型高分子多孔小球（直徑為0.18 mm～0.25 mm）成人日韩欧美一区二区免费，氮氣為載氣igao为爱寻找激情，用外標法測定乙酰乙酸乙酯中殘留丙酮的含量www.在线黄片.com。結果：該方法在丙酮濃度范圍在25 μg/ml～400 μg/ml內呈良好的線性關系，響應曲線相關系數為0.996日韩一日韩欧美中文字幕，平均回收率為96.8%。結論：本法簡便在线无码抽查视频，快速www.亚洲欧洲、實用，靈敏度高欧美日韩免费一区中文字幕，可有效地用于乙酰乙酸乙酯的質量控制黄色视频怎么搜才好看。

Objective To determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of Edaravone, by gas chromatography.Methods Sample solution was injected on a GDX column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.The residue was calculated by the external standard method.

摘要］ 目的：用氣相色譜法測定依達拉奉合成起始原料乙酰乙酸乙酯中丙酮的殘留量方法：采用固定相二乙烯苯乙基乙烯苯型高分子孔小球（直徑為0.18 mm～0.25 mm），氮氣為載氣欧美嗷嗷叫，用外標法測定乙酰乙酸乙酯中殘留丙酮的含量免费乱伦视频网址。

Aim at diluting and eliminating agminated or dispersed pigments which caused by various flecks, deoxidized pigment for those have melanin forming badly, Invisible peeling with no residual, dispel ling the spot, whitening skin professional.

2009.10.17 是鄭州的又一次美博會，我公司特別組團去參展俄欧美激情A片在线观看，主要產品是美白產品：&美白天使&針對各種色素聚集型或分散型斑點進行淡化和消除在线观看亚洲视频，對黑色素沉積過多者進行色素還原，隱形換膚無殘留视频se，祛除斑點欧美牲交免费一级A片影院，專業(yè)美白肌膚。

Chibeitao, scissors, can reduce root pedicle of the particles to retain integrity, and the dilution of salt water immersion, to elimination of the effect of residual also clean the surface layer of tunica albuginea can squeeze some toothpaste, the grape placed in the palm of your hand, light Knead increases, the water, can be completely crystal clear, eating up more peace of mind!

吃葡萄時美女扒开下边喷水黄网站，先拿剪刀減到根蒂部分5Ⅴ99COm，使其保留完整顆粒，并浸泡稀釋過的鹽水免费看性爱，達到消菌的效果污视频久久久，沖洗乾凈表面還殘留一層白膜，可擠些牙膏日韩最大的黄色网站，把葡萄置于手掌間日韩二区精品，輕加搓揉，過清水之后毛片在，便能完全晶瑩剔透十八禁无码R片在线观看，吃起來更安心！

In this condition, it makes the AlN films residual stress under controlled.

并能夠使薄膜的應力在控制的范圍內国产精品久久久综合桃花网。

We report a young male patient who experienced seizure after local injection of 3mL 2% lidocaine with epinephrine 1:200,000 around a recurrent nasal angiofibroma. After receiving 100% oxygen via mask and thiamylal sodium, the patient had no residual neurologic sequelae.

一名26歲男性黄色a片在线看，罹患復發(fā)之鼻腔血管纖維瘤自拍视频日韩图片在线观看网站，於鼻腔內注射3毫升局部麻醉劑lidocaine后，產生癲癇轻点肏我在线观看91，在給予氧氣與注射thiamylal后婷婷在线综合，病人完全恢復且無殘留其他神經癥狀。

Increasing of anoxic phase is favourable to reduce the production of residual activated sludge.

厭氧段的插入可以減少剩余污泥的產量亚洲色一色噜一噜噜噜性色av。

Methods With deltamethrin impregnated bednets and alphamethrin residual spraying and bednet impregnation to control malaria vectors,observe the change of density of An anthropophagous and Ansinensis and malaria incidence and calculate the costs.

采用溴氰菊酯浸帳滅蚊和浸帳加氯氰菊酯滯留噴灑的方法防制瘧疾媒介成人无码秒播在线观看网站免费视频，觀察嗜人按蚊、中華按蚊的密度變化和瘧疾發(fā)病率超碰在线91免费，按照人均所需費用核算成本色欲综合视频一区二区在线观看。

Deltamethrin imˉpregnated bednets can effectively decrease the density of An anthropophagous to control malaria and can save0.58Yuan per person compared with alphamethrin residual spraying and bednet impregnation.

溴氰菊酯浸帳滅蚊能有效降低嗜人按蚊密度，控制瘧疾發(fā)病尤物性爱视频免费看，比浸帳加滯留噴灑滅蚊人均節(jié)約經費0.58元性与色欧美视频在线播放网站。

Results Compared with control areas,density of An anthropophagous deˉcreased by57.85%～100%and An sinensis decreased by27.06%～86.05%;the malaria incidence decreased by27.32%～100%.Cost calculation:the cost was0.59Yuan per person with deltamethrin bednet impregnation and1.17Yuan with deltamethrin impregnated bednets and alphamethrin residual spraying.

結果 實驗區(qū)與對照區(qū)相比，嗜人按蚊密度下降57.85%～100%熟妇的屁眼，中華按蚊密度下降27.06%～86.05%黄色网站操逼片；瘧疾發(fā)病下降27.32%～100%；以人均花費進行成本核算国产一国产一级毛片视频在线5828，溴氰菊酯浸帳滅蚊的費用為0.59元/人全部国产肥熟女，溴氰菊酯浸帳加人群活動場所氯氰菊酯滯留噴灑滅蚊的費用為1.17元/人。