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The factors affect on the degree of substitution of product, yield and apparent viscosity, such as the mol rates of EPTAC with -NH2, reaction temperature, reaction time and the content of water in system have been discussed in detail. FTIR spectrometer and UV spectrometer are used to characterize the structure of the derivative and it is proved that substitution reaction mainly occurs on the -N element .The particle size and morphology of chitosan and quantemary ammonium salt of chitosan are analysised by comparing photos of their scanning electron microscope. The degree of substitution of HACC is determined by acid -base conductometric titration. An error in current formula of DS has pointed out and a correct formula has presented.On the base of experience of above experiment, the reaction conditions of HACC were systematically investigated through orthogonal design, and then the best conditions are found. Water-solubility and dependence of pH are studied.

壳聚糖和环氧丙基三甲基氯化铵在异相条件下发生反应，通过单因素实验，制备了一系列不同性能的壳聚糖季铵盐，本文首次详细讨论了反应条件(反应摩尔比、反应时间、反应温度、水含量)对产率及产物性能的影响；用红外光谱和核磁共振对结构进行表征分析时，发现季铵盐阳离子基以N位上取代为主；通过电镜图片对壳聚糖和季铵盐衍生物外观形貌进行对比，采用酸碱电导滴定法测定产物的取代度，并对常用取代度公式做了修正。

In order to adapt the rural electricity system which has the character load fluctuate frequentand the range of fluctuate is large, this paper apply instantaneous reactive power theory to detectreactive current of the system, this method enhance the speed of detection, at the same time, it canassure the detection precision when the load of rural electricity system is dissymmetric.

为了适应农电系统负荷波动频繁且波动范围大的特点，本文应用瞬时无功功率理论检测系统的无功电流，这种检测方法即提高了检测的速度，同时在农电系统负荷不对称的情况下也能保证检测精度。

At that time the foreign petroleum companies that have been crouching greedily in anticipation of gobbling up a share of the market will surely leap in, break up the current duopolistic situation, and engage in heartless hand-to-hand combat with the CPC and the Formosa Plastics Group.

届时，早已虎视眈眈意图分一杯羹的外国油品公司势将长驱直入，打破目前的双占局面，与中油及台塑两家公司展开无情的肉搏战。

In this paper, titanium ethoxide was synthesized by the direct electrochemical method. The production was characterized by Raman spectra. The effects of different factors on the voltage, current efficiency, material yield and space-time yield were investigated.

采用直接电化学法合成乙醇钛，采用激光拉曼光谱对产物进行了表征，详细探讨了电解时间、电流密度、支持电解质浓度、电解液温度以及电极间距对槽电压、电流效率、产物收率和时空产率的影响。

Kinds of culture in 21st century are becoming compatible and fusional. Vocal art is of no exception. Based on the current situation andtrend, this article applies methods such as Historical-Descriptive,culture perspective and theoretical analysis to the research of singing skills of bel canto and the folk singing in order to analyze the art characteristics and the real possibility of fusion between them. At the same time, successful examples are combined to work out the possible way for the application of bel canto in folk singing and nationalization of bel canto.

二十一世纪的文化是兼容并蓄、融合发展的文化，二十一世纪的声乐艺术亦如此，正是基于这一现状和趋势，本文旨在运用历史描述、文化比较和理论分析等方法，通过对美声唱法和民族唱法歌唱技巧的研究，分析两种唱法的艺术特性和两者融通的现实可能性，同时结合一些成功的实例试图给出民族唱法美声化和美声唱法民族化的可能途径。

In this paper, by using the research results of rock permeation mechanics, the author set up the hydraulic model of rock fractures firstly. Then, the author analyzed the current research results of rheology of ordinary portland cement and micro-fine cement grouts, and established the rheological model and the relationship of rheological parameters to hydraulic time.

本文首先借鉴岩体渗流力学的研究成果，建立了适合于研究浆液运动的岩体裂隙模型；然后对现有的水泥浆流变性的研究成果进行了综合归纳和分析，确定了浆液的流变模型和流变参数与水化时间的关系式。

The current theory and application of Al-Si alloy mainly focus on the study of hypoeutectic and eutectic, therefore we systematically analyzed the modification process of hypereutectic Al-Si alloy based on the methods and results of predecessors. Several factors including the modification temperature, the content of modifier, the available holding time, the times of repeat melting , the casting temperature and the speed for cooling have been studied in order to understand its effects to the composition, function and performances of primary silicon and eutectic silicon.

中文摘要本文针对目前Al-Si合金相关应用和理论的研究多集中于亚共晶和共晶合金的情况，在前人的研究成果和研究方法的基础上，对过共晶Al-Si合金变质处理进行了较为系统的分析，研究了变质剂的成分配比、变质温度、变质剂的加入量、变质后的静置时间、浇注温度及冷却速度等因素对过共晶铝硅合金中初晶硅和共晶硅的大小、形状、数量和分布的影响。

The current theory and application of Al-Si alloy mainly focus on the study of hypoeutectic and eutectic, therefore we systematically analyzed the modification process of hypereutectic Al-Si alloy based on the methods and results of predecessors. Several factors including the modification temperature, the content of modifier, the available holding time, the times of repeat melting , the casting temperature and the speed for cooling have been studied in order to understand its effects to the composition, function and performances of primary silicon and eutectic silicon.

本文针对目前Al-Si合金相关应用和理论的研究多集中于亚共晶和共晶合金的情况，在前人的研究成果和研究方法的基础上，对过共晶Al-Si合金变质处理进行了较为系统的分析，研究了变质剂的成分配比、变质温度、变质剂的加入量、变质后的静置时间、浇注温度及冷却速度等因素对过共晶铝硅合金中初晶硅和共晶硅的大小、形状、数量和分布的影响。

Choose medicaments correctly, reasonable use medicaments, in order to make sure with medicine safety is mixed effective will be henceforth the main task that clinical medicine learns, for solution control hospital the clinical current situation that use drug reachs existence issue, promote the development of the reasonable job that use drug, raise a hospital reasonable the level that uses drug, the prescription of two place has outpatient service of author general hospital, be in hospital analytic research, summary goes out unreasonable a few big states that use drug, undertake classified at the same time. 1 clinical unreasonable with medical analysis each division all applies 1 abuse of 1 · or antibiotic of blind application antibiotic extensively, utilization rate amounts to 70% above, among them couplet is used rate be as high as 40%, appear even 2 couplet, triplex above, the commonnest abuse is infection of the upper respiratory tract, be admitted to hospital give 2~3 to plant antibiotic cure. 1 · of 1 · 1 without point to this kind to the cure that ask for uses drug unreasonable with medicine main show is in the person that the virus sex appeal such as hepatitis of sex of common cold, chicken pox, berpes zoster, virus is caught, in infection of not amalgamative bacterium, point to without what apply antibiotic ask for next using medicine. Incontrollable virus affects antibiotic, increase hepatic burden instead to patient of virus sex hepatitis.

梗概： 正确选择药物，并合理使用药物，以保证用药平安和有效是今后临床药学的重要任务，为了解把握医院临床用药目前状况及存在新问题，推动合理用药工作的发展，提高医院合理用药的水平，笔者将医院门诊、住院两处的处方进行分析探究，总结出不合理用药的几大状况，同时进行分类。1临床不合理用药的分析1·1滥用或盲目应用抗生素抗生素各科均广泛应用，使用率达70%以上，其中联用率高达40%，甚至出现二联、三联以上，最常见滥用为上呼吸道感染，入院给予2~3种抗生素治疗。1·1·1无指征的治疗用药这类不合理用药主要表现在普通感冒、水痘、带状疱疹、病毒性肝炎等病毒性感染者，在未合并细菌感染，无应用抗生素的指征下用药。

At the same time, this article deep analyzed that on the current enterprise has bias of concept in the process of accounting error corrections, manipulation of profits and other issues. To analyzed the phenomenon that enterprise using error correction to adjust profit caused for inveracious accounting information, financial false, this phenomenon caused by some motivation such as avoid consecutive losses, maintain the qualification of refinancing and so on.

同时，本文对目前企业进行会计差错更正所产生的观念偏差，利润操纵等问题进行了深刻剖析，分析了企业出于避免连续亏损，保持再融资资格等动机利用会计差错更正调整利润造成会计信息不实，财务虚假的现象。

Do you know, i need you to come back

你知道吗，我需要你回来

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。