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你可能喜欢n-hexane是什么意思_n-hexane在线翻译、解释、发音、同义词、反义词_英语单词大全_911查询
n-hexane是什么意思
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n-hexane是什么意思 n-hexane在线翻译 n-hexane什么意思 n-hexane的意思 n-hexane的翻译 n-hexane的解释 n-hexane的发音 n-hexane的同义词
n-hexane英 ['enh'eks?n]　美 ['enh'eks?n]　n-hexane 基本解释正己烷n-hexane 网络解释1. 1. 正己烷：预防和控制其职业危害 ,将正己烷职业中毒概况及防治研究进展综述如下. 1接触机会与中毒概况正己烷 (n hexane)属饱和脂肪烃类 ,分子式为CH3 (CH2 ) 4CH3 . 由于正己烷几乎不溶于水 ,溶于醚和醇 ,故常作为溶剂在工业中广泛应用 ,2. 正已烷：n-Heptanoic acid 正庚酸 | n-hexane 正已烷 | n-methylcantharidimide 甲基斑蟊胺3. 3. 正乙烷：Soxhlet extraction 索氏提取 | N-hexane 正乙烷 | Adjuvant 硝普钠4. (四八)正己烷：(四七)四氢呋喃 Tetrahydrofuran | (四八)正己烷 n-Hexane | (四九)汽油 Gasolinen-hexane 双语例句1. n-hexane1. Then centrifuge 4000r/min. Transfer supernatant into a new centrifuge tube and add n-hexane for extraction. Then evaporate to dryness and concentrate by passing basic alumina solid-phase extacion. Wash with 5ml mobile phase and test with by HPLC. LC operating conditions:C18, 150 ×4.6 Mobile phase, phosphoric acid(0.02mol/L) and A Column temperature, 35 ℃; Sample size, 50 UV-Detector, 275nm.&&&&经实验对比，确定同时检测禽蛋中六种磺胺类药物的样品前处理方法为：样品加入乙腈高速匀浆，4000r/min 离心，上清液加入正己烷萃取，取乙腈层旋转蒸发近干，溶解残渣，过用95%的乙腈溶液预洗过的碱性氧化铝SPE柱，5ml 流动相洗脱，洗脱液上高效液相色谱仪检测；高效液相色谱检测条件为：C18 柱，流动相为磷酸溶液(0.02mol/L)和乙腈梯度洗脱，柱温为35℃，进样量50ul，紫外检测器，检测波长为275nm。2. In the silver nitrate column method, the quality of the methyl ester sample introduction of the mixed fatty acid is 0.5 percent to 10 percent of the quality of filled si elution gradient is n-hexane solution containing acetone the content of which is 0.5 percent to 15 the elution speed is 0.5 to 5ml/min.&&&&所述的硝酸银柱法中混合脂肪酸甲酯上样质量为填充的硝酸银硅胶质量的0.5％～10％，洗脱梯度为含0.5％～15％丙酮的正己烷溶液，洗脱速度为0.5～5ml/min。3. n-hexane什么意思3. The method was based on the extraction of the herbicides residues with acetonitrile and a cleanup with a Florisil column followed by elution with a mixture of n-hexane and acetone (6:4 by volume) and GC-MS/SIM detection.&&&&粮谷与油籽中二苯醚除草剂残留通过乙腈提取，浓缩后过弗罗里硅土柱净化，采用正己烷－丙酮（体积比6：4）溶液淋洗，淋洗液吹氮至干后以正己烷定容，GC-MS选择离子监测模式测定。4. Reductive conversion of geraniol to citronellol is adopted as a model reaction, and several factors in the reaction are discussed using gas chromatography method. The influence of n-hexane and butyl acetate, as organic solvents, on biocompa the influence of methanol, ethanol, glycol, n-butanol and 1-hexanol, as energy substance, on the transformation efficiency was compared, the catalysis capabilities of Baker's yeast, XST-KO yeast, LP yeast, alcohol yeast, dry yeast, Saccharomyces cerevisiae, Angel yeast and Meishan yeast were discussed. It has been proved that biocompatibility of n-hexane are much better than that of butyl acetate, and the hexane has been demonstrated the most effective in terms of the influence on biotransformation, Baker's yeast has shown the highest tranformation efficiency among the eight yeast strains.&&&&以香叶醇转化为香茅醇作为模型反应，通过气相色谱法进行定性和定量分析研究了影响该有机相生物转化反应的几个基本因素，考察了两种有机溶剂正己烷和乙酸丁酯对生物相容性的影响，选用甲醇、乙醇、乙二醇、正丁醇和l-己醇分别作为能量物质进行实验，比较其对转化的影响并探讨了Baker's酵母、XST-KO酵母、LP酵母、酒精酵母、假丝酵母、干酵母、安琪酵母和梅山酵母八种不同酵母作为生物催化剂对模型反应的催化能力，结果表明，正己烷作为有机溶剂，其生物相容性明显好于乙酸丁酯，更加有利于该生物转化反应进行；乙二醇作为能量物质，该模型反应转化率最高；而 Baker's酵母作为生物催化剂，对该模型反应的催化能力最强，最适合作为该模型反应的催化剂。5. The effects of acidity and pore structure on n-hexane isomerization performance of Pt/ZSM-5 were investigated.&&&&考察了酸性和孔道结构对Pt/ZSM-5的异构化性能的影响。6. Because of the present of La, the absorption capacities of n-Hexane and Cyclo-Hexane of La-containing ZSM-48 decrease.&&&&由于La的存在，使含镧ZSM-48的正己烷、环己烷的吸附量都减小。7. Adsorption experiments showed that ZSM-34 possessed high pore volume, and the adsorption amount of n-hexane reached 11.4%.&&&&吸附实验显示，所合成的分子筛具有较大的孔容，其对正己烷的吸附容量为11.4%。8. danci.911cha.com8. It is shown that solubility of ethylene can be described by Henry＇s law and that of n-hexane and iso- pentane is non-linear.&&&&聚乙烯结晶度20％～72％范围内，有机小分子在聚乙烯中的溶解度随结晶度的增加而减小。9. The results suggested that the average concentrations of benzene and N-hexane were higher than the hygienic standard of our country.&&&&生产环境检测结果，只有苯和正己烷平均浓度超过国家卫生标准。10. The results showed that VACF had high saturated adsorption capacity for organic gas with high po- larity, benzene, and reached saturated adsorption within a long period of time, but had low saturated adsorption capacity for or- ganic gas with low polarity, n-hexane, and reached saturated adsorption within a short period of time.&&&&结果表明：VACF对极性较大的有机气体苯饱和吸附量较大，达饱和吸附的时间较长；而对极性较小的有机气体正己烷饱和吸附量较小，达饱和吸附的时间较短。11. Liquid/liquid total internal reflection fluorescence spectra measurements were realized on a home-made spectrofluorimeter. A comparison was made for the differences in fluorescence spectra of meso-tetrakis(4-sulphonatophenyl) porphyrin at n-hexane/H2O interface and in aqueous solution by using TIRF. It was indicated that deprotonated forms of TPPS TPPS(superscript 4- were adsorbed selectively at the n-hexane/H2O interface in the presence of cationic surfactants.&&&&&&在自行组装的全内反射荧光测定装置上实现了液／液介面全内反射荧光光谱的测绘，比较了水溶性的meso-四卟啉在正己烷／水界面上与在水相中荧光性质的差异，研究了全内反射荧光强度随表面活性剂种类、浓度及溶液pH值的变化情况，探索了TPPS的介面吸附行为，著重考察了阳离子表面活性剂CTMAB对TPPS界面荧光性质的影响。12. Optimization technology was acetidin: N-hexane (3:7) as low-pole solvent system, methanol: dichloromethane (1:9) as polar solvent system, 20% glycerol filter paper as moisturizer, 14 h age Bacillus subtilis as indicating strain seed on thin layer plate cultivated for 14~18 h, 1% TTC staining time 1~2 h, bacterial mix method suitable to 0.2%~0.6% agar semisolid bouillon culture-medium, bacterial spread method suitable to 1% agar semisolid bouillon culture-medium.&&&&&&结果：该方法展开系统筛选简单，抑菌斑位置准确、斑点清晰，其优化条件为：以乙酸乙酯：正己烷(3：7)为弱极性展开系统，甲醇：二氯甲烷(1：9)为强极性展开系统，用20%甘油滤纸对湿室保湿，以14h菌龄的枯草芽孢杆菌为指示菌种子液，自显影薄层板36℃培养14~18h，1%TTC显色时间为1~2h，含0.2%~0.6%琼脂的半固体肉汤培养基应使用混菌法生物自显影，含1%琼脂半固体肉汤培养基应使用涂布法生物自显影。13. 13. Dense BaTiO3 ceramic fibers were obtained by solvothermal treatment of the green gel fibers, which were drawn from a sol using barium acetate hydrate and catechol-complexed titanium isoproposide as starting materials, at 180℃ for 12h in n-hexane following a heat process to 1100℃ with a heating rate of 1℃/min for crystallization.&&&&&&文章摘要：采用醋酸钡和异丙醇钛为原料，邻苯二酚作钛醇盐的稳定剂，制备了BaTiO3凝胶纤维；采用正己烷作溶剂，将BaTiO3凝胶纤维在180℃条件下溶剂热处理12h；对预处理过的BaTiO3纤维以1℃／min的升温速率热处理至1100℃，得到致密的BaTiO3陶瓷纤维。14. From n-hexane, the adsorption enthalpy of aniline on sulphonic resin in Cu〓 form is nearly zero, the isotherms being independent of the temperature.&&&&&&在正己烷中，磺酸铜型树脂对苯胺的吸附焓近于零，吸附等温线不随温度的变化而变化。15. 15. In 20 liters'container, we measured the LEL and the UEL of n-pentane, n-hexane, n-heptane, n-octane, n-nonane at the temperatures ranging from 25℃to 210℃.&&&&&&用约20L的爆炸容器，在25~210℃测定了正戊烷、正已烷、正庚烷、正辛烷、正壬烷的爆炸下限和爆炸上限值。16. The results showed that oxazepam and mandelic acidamide were separated success-fully. In the mobile phase of n-hexane, iso-propanol and acetic acid (80:20:0.1, V/V), the resolution of oxazepam's and mandelic acidamiale's were 2.59 and 3.63, respectively. But chlorthalidone was not got chiral separation.&&&&&&结果表明，去甲羟基安定和扁桃酰胺在正已烷／异丙醇／乙酸为80：20：0.1条件下都获得了很好的分离，其最佳分离度分别为2.59和3.36，氯噻酮则未获得分离。17. 17. Objective To establish a method for determination of n-hexane in the air ofworking place by solvent desorption gas phase chromatography.&&&&&&目的 建立工作场所空气中正己烷的溶剂解吸气相色谱测定方法。18. The activity of kairomones existing exuvia and silk was stronger than that existing in faeces. The kairomone components from these products associated with P. xylostella larvae could be effectively extracted by n-hexane, dichloromethane, ethyl ether, methanol and acetone. No kairomone components for host location by C. plutellae were extracted from egg shells or pupa cases of P. xylostella.&&&&&&其中，幼虫蜕和幼虫丝的活性较强，幼虫粪便中的利它素活性相对较弱；幼虫蜕、丝及粪便中的寄主利它素均能被正己烷、二氯甲烷、乙醚、甲醇、丙酮五种有机溶剂有效地提取，在卵壳和蛹壳中不存在引起菜蛾绒茧蜂寄主定位的利它素。19. Flubendazole was extracted from samples with acetonitrile, then filtered. The extract was partitioned with n-hexane, evaporated to dryness, and then cleaned up through C18 cartridge before quantitatively determinated by HPLC.&&&&&&检体以乙萃取，经过过滤，再以乙饱和之正己烷去除油脂、杂质及浓缩后，以Bond Elut C18样品处理匣净化，最后利用高效液相层析仪分析定量。20. Samples were prepared by protein precipitation with acetonitrile and defatting with n-hexane. The analytes were detected with API 4000 triple quadrupole tandem mass spectrometer equipped with ESI source in the positive ion mode.&&&&&&猪肉样品中加入乙腈沉淀蛋白，经正己烷脱脂后，采用液相色谱-三重四极杆串联质谱检测，使用电喷雾离子化源，在正离子条件下以多反应监测方式进行扫描。n-hexane是什么意思,n-hexane在线翻译,n-hexane什么意思,n-hexane的意思,n-hexane的翻译,n-hexane的解释,n-hexane的发音,n-hexane的同义词,n-hexane的反义词,n-hexane的例句,n-hexane的相关词组,n-hexane意思是什么,n-hexane怎么翻译,单词n-hexane是什么意思常用英语教材考试英语单词大全 (7本教材)
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&2017 　京ICP备号-6　京公网安备30　n和l的发音比较和发音练习
n和l的发音比较和发音练习
一、相同：
n和l的口型差不多是一样的，发l时口型比发n时大一些
二、不同：
不一样的是发音时舌尖的位置。
&n：舌头伸出牙齿，上下牙齿轻轻咬住舌尖，用喉咙发音的同时舌尖收回，发出的就是n。
l：嘴巴微张，舌尖顶住上颚，喉咙发音的同时舌尖放下，发出的就是l。
练习n音就来回把舌尖送出嘴唇再收回，练习l音就闭上嘴让舌尖在嘴里上下活动。
n：舌尖抵住上齿龈，软腭下降，打开鼻腔通路，气流振动声带，从鼻腔通过。如：“能耐”、“泥泞”的声母。
&　l：舌尖抵住上齿龈，软腭上升，堵塞鼻腔通路，气流振动声带，从舌头两边通过。如“玲珑”、“嘹亮”的声母。
由于n发音时，气流从鼻腔通过，所以发出的声音带有“鼻音”，而l在发音时注意舌头的动作，即在发音前，舌头向上卷，发音时，舌头伸平，不带有鼻音，即使用手捏住鼻子也能发音。
& 做法一：按照n的发音要求做好发音准备。用拇指和食指捏住鼻孔并试图发n音。如果有很强的憋气的感觉，说明发音的部位和方法正确，松开拇指和食指，带上元音e或a呼读，n则自然成声；反之则错误。
做法二：按照l的发音要求做好发音准备，用手捂住嘴巴，并试图发l音，如果两腮鼓起并伴有憋气的感觉，说明符合发音要求，移开手掌，带上元音e或a呼读，l则自然成声。
1.词组练习
－无奈n&i；水牛ni& －水流 li&
男n&n 裤－蓝l&n 裤；旅lǚ 客－女nǚ 客
脑nǎo 子－老lǎo 子；连li&n夜－年ni&n夜
留念ni&n －留恋li&n；浓n&ng 重－隆l&ng 重
南n&n 部－蓝l&n 布；烂泥n& －烂梨l&牛ni& 黄－硫li& 磺；大娘ni&ng
－大梁li&ng
2.选音练习
哪里 nǎlǐ
纳凉 n&li&ng
奶酪 nǎil&o
nǎol& 内涝 n&il&o
能力 n&ngl&
来年l&ini&n
老农lǎon&ng
冷暖lěngnuǎn
流脑li&nǎo
留念li&ni&n
岭南lǐngn&n
牛奶ni&nǎi
恼怒 nǎon&
扭捏 niǔniē
n&ngn&i 呢喃 n&n&n
男女 n&nnǚ
履历lǚl& 理论
lǐl&n 联络
lǎoli&n 拉力 lāl&
3.绕口令练习
小牛放学去打球，踢倒老刘一瓶油，
小牛回家取来油，向老刘道歉又赔油，
老刘不要小牛还油，小牛硬要把油还给老刘，
老刘夸小牛，小牛直摇头，
你猜老刘让小牛还油，还是不让小牛还油。
妞妞和牛牛，牛牛要吃河边柳，
妞妞护柳要赶牛，牛牛扭头瞅妞妞，
妞妞扭牛牛更牛，牛牛要顶妞妞，
妞妞捡起小石头，吓得牛牛扭头溜。
龙怕农，老龙恼怒闹老农，老农恼怒闹老龙，
龙怒龙恼农更怒，龙闹农怒龙怕农。
n&、nā、n&i：哪
nǒ、něi、n&娜
nǎi：奶
n&ng、nāng
n&ng、nǎng
n&、nǚ
nǎo：恼
nǐ：您
niān：粘
ni&n、zhān
niǎo：茑
niē：涅
n&ng、n&ng：拧
n&ng、nǐng、n&ng
niū：扭
n&n、n&n：傩
四、视频解读
1./show/1A8gxWpqHcUa2q_IyLaiHQ...html
3./programs/view/znF8TG15iEA/?union_id=500_01_01&tpa=dW5pb25faWQ9MTAyMjEzXzEwMDAwMV8wMV8wMQ&
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以上网友发言只代表其个人观点，不代表新浪网的观点或立场。请问 符号§ 读法 读音我是看到线性代数上每小节前面要加这个符号，要是会读的话比较舒服点，看例子：§1 二阶与三阶行列式§2 n阶行列式
很肯定地说：§读作可西（“可”读轻音）
4,6,8设第二项为a2 公差为d 则3a2=18a2=6(a2-d)^2+a2^2+(a2-d)^2=116(a2-d)^2+(a2-d)^2=802a2^2+2d^2=8072+2d^2=80所以公差 d=2所以等比数列为4,6,8
高一数学(基本不等式)已知函数f(x)=x^2-ax,a∈R已知函数f(x)=x^2-ax,a∈R,设x＞y＞0,且 xy=2,若不等式 f(x)+f(y)+2ay≥0恒成立,求实数a的取值范围
怎么化简二次根式的乘除,如：根号下-a的平方-a*根号下-a分之1；如：x*根号下y的平方分之-x的立方会的教下如：a*根号下-a的平方分之a+1；如：A=根号下（a的平方+4）的4次方会的能教下么?
函数f(x)=(x+a)是偶函数的充要条件是急,……对…有平方的
(-1/13)^11*(-6)^11=(6/13)^11=6^11/13^11,（1/2）^12=1/2*(1/2^11),则[6^11/13^11]*[1/2*(1/2^11)]=1/2*(3/13)^11
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