甲下的
- 与 甲下的 相关的网络例句 [注:此内容来源于网络,仅供参考]
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We gained the ethynylferrocene in high yield by the the reaction of triphenylphosphine with chloroform or bromoform in the presence of KOBu~t to give witting reagent, which reacted with formylferrocene and then followed by n-butyllithium dehydrohalogenation.
在本论文的第二部分,我们用三苯基磷与溴仿或氯仿在叔丁醇钾作用下,制得三苯基磷甲叉烯,然后与二茂铁甲醛反应,得到二氯取代烯烃,在正丁基锂作用下得到二茂铁乙炔。
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First, a chlorinator was self-designed in this paper, and dichloride of 2-methyl-1-propene was synthesized by 2-methyl-1-propene reacted with chlorine fast in this reactor. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the yield and selectivity of dichloride of 2-methyl-1-prop-ene were more than 65% and 80% respectively. Second, the preparation of 2-methylene-1, 3-propanediol, which dichloride of 2-methyl-1-propene reacted with alkali was investigated. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the conversion of dichloride of 2-methyl-1-propene was 100%. Moreover the preparation of MPO, which 2-methylene-1, 3-propanediol reacted with hydrogen, in presence of Al_2O_3-Pd catalyst, was gotten, and the product was appraised.
本文在氯化反应过程中,自行设计制作出了氯化管式反应器,在该反应器中异丁烯和氯气迅速混合反应生成二氯异丁烯,根据该氯化反应特征利用正交试验和单因素试验考察了有关因素的影响并优化得到了最佳工艺条件,二氯异丁烯的总收率达65%以上,选择性达80%;接着,对二氯异丁烯进行水解反应制得了2-甲烯-1,3-丙二醇,讨论了相关因素对水解反应的影响,并通过正交试验和单因素试验得到了较佳工艺条件,二氯异丁烯的转化率达100%;同时还对制备的2-甲烯-1,3-丙二醇在常压下采用三氧化二铝负载钯催化剂催化加氢得目的产物MPO,并对产品进行了鉴定,从而打通了整个工艺路线。
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HCV is now know to be the major cause of parenterally transmittednon-A,non-B hepatitis.until the virus was characterized,diagnosis was made by exclusion of all other known case of hepatitis.
丙型肝炎病毒是目前所知为主要原因肠胃传染非甲非乙型肝炎,直到病毒的特点是,诊断作了排斥所有其他已知的情况下,肝炎抗体,丙型肝炎病毒被发现,在过去八成患者记载翔实非甲非乙型肝炎肝炎世界广泛流行的丙型肝炎病毒是0.2 %,献血达80 %和静脉其它途径如共用针头职业接触血液和血液透析,但在接近半数的丙型肝炎病毒感染的传播途径则不详。
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David humbly divested himself of his royal attire and, wearing only a simple linen ephod, joined the common people in dancing and worshipping God before the Ark, His "unkingly" behaviour caused his wife Michal to despise him (6:16), and she sarcastically charged him with being base or lowly.
大卫谦卑的脱下自己的王服,只穿一件简单的细麻布以弗得,与百姓一同在约柜前跳舞、敬拜上帝。他「不合国王体统」的举止使他的妻子米甲看轻他(6:16)。米甲嘲讽大卫无耻、轻贱。
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Methylene blue is reduced and faded by ascorbic acid in the medium of dilute hydrochloric acid( pH=2) with sulfanilic acid as a catalyst.The optimal conditions of the fading reaction were investigated in detail.Based on this fading reaction a new spectrophotometric method for the determination of ascorbic acid was established.
确定了亚甲蓝与抗坏血酸褪色反应的最佳条件,在 pH=2的缓冲溶液和对氨基苯磺酸存在的条件下,抗坏血酸能够很快还原亚甲蓝并使之褪色,褪色反应的体系具有很好的稳定性。
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Cellulose benzoate,the degree of substitution of which was calculated from the content of C determined by element analysis,was prepared from microcrystalline celluloseand benzoyl chloride under heterogeneous condition and characterized by FT-IR and~1H-NMR.
研究了微晶纤维素和苯甲酰氯在多相条件下合成制备纤维素苯甲酸酯的反应,通过元素分析所得碳的质量百分含量计算了产物的取代度,并系统研究了吡啶与N,N-二甲基乙酰胺或与三乙胺混合反应溶剂、苯甲酰氯与纤维素羟基的摩尔比r、反应温度和反应时间对D S的影响,用FT-IR和1H-NM R对产物进行了表征。
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Measure the items on before and after the two courses of treatment respectively (one course for 15 days) as follows:①Syndromes Investigation: to adopt the scoring methods of symptoms and signs with the certain standard scoring table of symptoms and classifying table of signs for the patients, on the day before and after the two courses of treatment respectively,②Signs Investigation: the mucoma visibility, swelling or hyperemia conditions, or gloyp and polypoid change in the inferior and middle nasal conchas, nasal septum, etc with a nasal endoscope on the day before and after the two courses of treatment respectively,③Test of the interferon-γ、interleukine-4(IL-4) in serum of patients by the method of enzyme linked immunosorbent assay on the previous day before and after the two courses of treatment respectively.
治疗组在治疗前、两个疗程结束后分别进行以下项目的观察:①临床症状的评定:治疗前及两个疗程结束后当天对患者鼻痒、鼻塞、流涕、喷嚏症状的程度进行评分;②体征的评定:治疗前及两个疗程结束后当天采用鼻额镜肉眼观察患者下鼻甲鼻粘膜颜色、肿胀情况,及中鼻甲是否可见,有否息肉样变等;③治疗前及两个疗程结束后一天清晨空腹抽取患者肘静脉血4ml离心后,采用酶联免疫吸附试验检测患者血清IFN-γ、IL-4的含量。
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Many people consider Reavers to be your trademark unit, coincidentally they paved your way to victory in game 3-5. Do you think they are especially good on Wuthering Heights?
很多粉丝认为金甲简直就是你的标志性进攻单位了,而且巧合的是金甲为你的最终胜利里下了汗马功劳,你认为在Wuthering Heights上特别好用嘛?
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Methods Eight cases of primary hyperparathyroidism and parathyroid adenoma for latest 5 years were retrospectively analyzed.
总结近5年8例原发性甲旁亢患者的手术治疗情况,分析治疗原发性甲旁亢的传统手术方式与小切口直视下切除术的特点。
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The empirical Freundlich equation was successfully employed to describe the adsorption process. Due to hydrogen-bonding interaction between the tertiary amino groups on the resin and the amino groups of p-methylaniline, the adsorption capacity towards p-methylaniline of NDA-8 is higher than that of NKA when the equilibrium concentration is 5 mmol/L.
结果表明:2种树脂吸附对甲苯胺均符合Freundlich等温吸附方程,NDA-8树脂表面叔氨基与对甲苯胺之间的氢键作用可有效强化吸附能力,在平衡浓度均为5mmol/L的情况下,其吸附容量达到NKA的1.5~1.6倍。
- 推荐网络例句
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Do you know, i need you to come back
你知道吗,我需要你回来
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Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.
1〕 杨银书,王祥生,李德昌。安徽省首次发现嗜群血蜱。
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Chapter Three: Type classification of DE structure in Sino-Tibetan languages.
第三章汉藏语&的&字结构的类型划分。