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To base on domestic and oversea productive technology and principle of gypsum, to combine with development of modern resin, and to improve traditional productive technology exploratively, the aim is to analyze influential factors in the course of synthesis of hemihydrated gypsum, enhance purity of hemihydrated gypsum on productive technology, synthesize a kind of dental gypsum and research preliminary on these existing questions about insufficient mechanical strength and worse surface hardness of present gypsum of molding materials to certain extent.

目的：基于周内外主要石膏模型材料生产工艺及原理，结合现代树脂类材料发展趋势，对传统生产工艺进行探索性改良，旨在对半水石膏合成中的一些影响因素进行分析，于制作工艺方面提高石膏纯度，使合成的石膏模型材料在一定程度上能改善现代石膏模型材料存在的机械强度不足和表面硬度较差的问题。

Pragmatic presupposition determines the choice of information focus and its position in a sentence,organizes the discourse into a coherent whole,concise,clear and smooth,and achieves the expected stylistic effects.in college english teaching,if teachers teach the knowledge about pragmatic presupposition in listening teaching,introduce the frequently-seen patterns of presupposition, increase the presuppositional sensitivity of students to certain words and structures,guide students to use the theory on presuppositional information to make forecasts on base of written listening material,listen purposefully,and get rid of the distraction of the minor and redundant information,the ability of students to obtain major information and linguistic inference will be strengthened and their listening competence will improve remarkably.george yule divided presuppositional triggers into factive presupposition,non-factive presupposition,counter-factive presupposition,existential presupposition,lexical presupposition and structural presupposition.presuppositional triggers are helpful for us to understand the true intention of the speaker or writer.in college english reading teaching,if teachers introduce the discourse organizing function of pragmatic presupposition and the relevant presupposition triggers,and teach students to use these triggers to communicate with the writer,the comprehension competence of students will be greatly enhanced.the essential function of presupposition is to build a framework for the further development of discourse.in college english writing teaching,teachers can use the theory on pragmatic presupposition to construct a handy training program for textual organization,increase the textual coherence, economy and structural perfection of the english writings by students.in college english translation teaching,teachers should focus on developing the pragmatic presuppositional thinking of students,enable them to grasp the presupposed information in source text / speech exactly,understand the original thoroughly,correctly reorganize and reproduce the pragmatic presuppositions in the target language,carry out the functional equivalence in translation and successfully realize the smooth and accurate communication.with the instruction of pragmatic presupposition in college english teaching,the complete understanding and integral acquisition of english and chinese of students will come true.in conclusion,to implement the curriculum requirements for college english teaching promulgated by the ministry of education of china,we should emphasize the instruction of the theory on pragmatic presupposition in college english teaching,carry it through from beginning to end.it's one of the important means to realize the college english teaching reform, improve the effects of college english teaching,strengthenr the practical and integrative language abilities of students,in order to cultivate the compound talents to adapt to the global integration and meet the requirements of the reform and opening in china.

在大学英语教学中，教师将语用预设知识贯穿于听力教学过程中，讲授一些常出现的预设类型，提高学生对一些特定的词语和结构的预设敏感度，引导学生运用预设信息理论对听力文字材料进行预测，有的放矢，排除次要、冗余信息的干扰，增强获取主要信息的能力和语言推理能力，从而提。。。更多高学生的听力理解水平。george yule将预设触发语分为事实预设、非事实预设、反事实预设、存在预设、词汇预设和结构预设，触发语有助于我们在阅读当中理解作者的真正用意。在大学英语阅读教学中，介绍语用预设的语篇组织功能和有关的预设触发语，并利用触发语来与作者进行交流，会极大地提高阅读理解能力。预设的基本功能就是为语篇的进一步发展建立一个框架。利用语用预设理论可以为大学英语写作教学构建一个易于操作的篇章组织训练方法，提高学生英语写作的语篇连贯性，经济性和结构优化。在大学英语翻译教学中，注重培养学生的语用预设思维，准确把握源语的前提信息，透彻理解原文，使语用预设在目的语中正确重组和再现，实现翻译的功能对等，交际的流畅性和准确性，并增强学生对英汉双语的全面性认识和整体性习得。综上所述，为更好地贯彻和实施教育部颁布的《大学英语课程教学要求》，在大学英语教学中重视语用预设理论的传授，使语用预设贯穿于大学英语教学的始终，是实现大学英语教学改革的重要手段，改善大学英语教学效果，增强学生的实用综合语言能力，培养符合全球一体化趋势，适应改革开放要求的复合型人才。

Based on an analysis of distribution pattern of hydrocyclone"s axial velocity, by changing the inlet flow rate Qi and split ratio Fand making an investigation in the effect of Qi and F on axial velocity field, the factors causing the forming of short-cut circuit and circulating flow are found. It is considered that the short-cut circuit and circulating flow are produced by the structure of the hydrocyclone, and can"t be eliminated completely, though they interfere the flow field inside a hydrocyclone and affect the separation accuracy. Test results show that, by increasing Qi and F and controlling them in a certain range, the separation efficiency of the hydrocyclone can be improved.

在研究旋流器轴向速度分布规律的基础上，分析了短路流与循环流的形成原因，试验研究了改变操作参数，即改变入口流量Qi与分流比F对轴向速度场的影响认为短路流与循环流是由旋流器结构决定的，很难完全消除，它们干扰了旋流腔和大锥段的流场，在一定程度上也影响了分离精度试验结果表明，加大入口流量Qi与分流比F，并将其控制在一定范围内，便可提高分离效率这项研究对水力旋流器分离机理的认识与实际应用均有重要意义

For an example of craft design about stamping forming of the gate of a certain railway freight car, formulize the craft calculation of fluctuate formation on a weathering steel plate of moderate thickness, and the method and course of simulating analysis about forming process using computer numerical simulation technology.

以某型铁路货车车门冲压成形工艺设计为例，阐述了耐候钢中厚板起伏成形的工艺计算以及利用计算机数值模拟技术进行成形过程的仿真分析的方法及过程。

Part One: thc conccpt and valuc analysis of judicial review system ofconstitutionalityJudicial review system of constitutionality is a fundamental system with legalsense to prevent violation of the constitution, which refers to that speciallydesignated state organs examine and conduct whether certain legis1ation or certainacts are constitutional or not. Generally it refers to the acts of state organ leaders,but in some states, it also includes the acts of political parties, for instance, Germanyl l lconstitutional court can exaxnine the organianion and acts of political pwties.

第一部分：违宪审查制度的概念与价值分析违宪审查制度是指由特定的国家机关对某项立法或者某种行为(通常为国家机关领导人的行为，有些国家还包括政党的行为，例如德国宪法法院可以审查政党的组织和行为)是否合宪所进行的具有法律意义的审查和处理的一种基本制度，是一种为防止违宪而设立的专门制度。

The universality of application of helicoidal surfaces in the engineering, the importance of their performance in the certain field and the non-replaceability of their functions in the specified mechanical systems have resulted in that the technology of measurement for helicoidal surfaces has been a critical research project in the field of dimensional measurements.

螺旋曲面在工程中应用的广泛性、在一定领域中其性能的关键性以及在特定机械系统中其功能的不可替代性，决定了螺旋曲面测量技术历来是几何量计测技术中一项重要研究课题。

It's found that the degradation bacteria had certain capability of transport of hexadecane by the experiments; and the processes of transport of n-hexadecane were largely different between two strains. Transport of hexadecane by DQ01 was slow, while active transport process of hexadecane by DQ02 was quite fast.

结果表明，降解菌对正十六烷均有一定的运输富集能力；2株菌对正十六烷的运输过程存在很大差别，DQ01对正十六烷的运输呈缓慢趋势，而DQ02对正十六烷的主动运输过程是比较快的。

As Bourdieu writes,"Body hexis speaks directly to the motor function, in the form of postures that is both individual and systematic ... a way of walking, a tilt of the head, facial expressions, ways of sitting and using implements, always associated with a tone of voice, a style of speech, and ... a certain subjective experience."

正如布尔迪厄所写的那样，&身体素性直接向运动官能阐明了既是个人的、也是社会的各种举止形式……走姿、坐姿、摆头、面部表情和器物使用等，总是与语气、讲话风格以及……某种特定的主观经验有关。&

Be in from the ground in the atmosphere advection layer of 50 kilometers of 15 ～, centered the ozone gas of on the earth 90%, although its chroma never exceeds 1/100000, all concentration rises to also have a even thinner than sole only, but it assimilated opposite substance effectively harmful, wavelengh is less than the UV-C of sun ultraviolet ray of 295nm, and opposite content hurtless, wavelengh is more than the UV-A of sun ultraviolet ray of 320nm to make them all pass however, opposite content has certain harm, wavelengh is in the UV-B of sun ultraviolet ray of 295 ～ 320nm also is absorbed for the most part.

在离地面15～50公里的大气平流层中，集中了地球上90%的臭氧气体，虽然其浓度从未超过十万分之一，全部集中起来也只有比鞋底还要薄的一层，但它却有效地吸收了对生物有害的，波长小于295nm 的太阳紫外线 UV-C，而对生物无害的，波长大于320nm 的太阳紫外线 UV-A 却让它们全部通过，对生物有一定危害，波长在295～320nm 的太阳紫外线 UV-B 大部分也被吸收。

The musical sensibility is apparent in the recurrence of certain locations, sounds, and camera setups; in the lightning-quick shot of the collapse of a tent, effected by Norbu's accomplice in the first horse theft that we see; in a remarkable sequence devoted to Norbu's extended praying and prostrations, which hypnotically combines camera movements and superimpositions with a use of other human figures that ambiguously alters our sense of his isolation; in the slow drip of water from melting snow that Norbu catches in a jug to bring to his ailing child; in the intricately structured sequence showing the clan's westward migration, as fine a piece of epic poetry as some of the grander collective movements in Ford; and above all, in the depictions of the Buddhist ceremonies and rituals, which are themselves patterned like musical structures.

在再现某些地点、声音和摄影机设置时，音乐感是显而易见的。快如闪电地拍摄一个帐篷的倒塌，这是我们所见 Norbu 参与到第一次盗马时所弄倒的； Norbu 长时间的祈祷和不断俯卧拜倒成就了一个标志性的场景，用了其他几个人物形象恍如催眠式地将摄影机运动和叠印一起使用，就这样含糊地改变了我们对他孤立的感受；Norbu用水壶接住融化的雪缓慢滴落下来的水，这是要带回去给他生病的小孩；复杂结构的场景展现了宗族的西迁，总之，佛教庆典和仪式的描写，其本身形式就很像音乐结构。

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。