摘要：自来水楼房五楼有水,六楼无压无水,能不能在水管上安一个加压水泵 楼主您好 如果你用管道增压泵，在管道没水的情况下，水泵空转是会烧坏的，还有管道没水你也加不上压力，管道泵必须是在有水的环境才能加压...

自来水楼房五楼有水,六楼无压无水,能不能在水管上安一个加压水泵...

楼主您好 如果你用管道增压泵，在管道没水的情况下，水泵空转是会烧坏的，还有管道没水你也加不上压力，管道泵必须是在有水的环境才能加压，如果你安装的话，也必须安装与之配套的缺水保护线路。

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急要一篇关于communication的八分钟英文演讲稿

Communication is the process of attempting to suggest information from a sender to a receiver with the use of a medium. Communication requires that all parties have an area of communicative commonality. There are auditory means, such as speaking, singing and sometimes tone of voice, and nonverbal, physical means, such as body language, sign language, paralanguage, touch, eye contact, or the use of writing. Communication is defined as a process by which we assign and convey meaning in an attempt to create shared understanding. This process requires a vast repertoire of skills in intrapersonal and interpersonal processing, listening, observing, speaking, questioning, analyzing, and evaluating. Use of these processes is developmental and transfers to all areas of life: home, school, community, work, and beyond. It is through communication that collaboration and cooperation occur.[1] Communication is the articulation of sending a message through different media,[2] whether it be verbal or nonverbal, so long as a being transmits a thought provoking idea, gesture, action, etc. Communication is a learned skill. Most people are born with the physical ability to talk, but we must learn to speak well and communicate effectively. Speaking, listening, and our ability to understand verbal and nonverbal meanings are skills we develop in various ways. We learn basic communication skills by observing other people and modeling our behaviors based on what we see. We also are taught some communication skills directly through education, and by practicing those skills and having them evaluated.Communication as an academic discipline relates to all the ways we communicate, so it embraces a large body of study and knowledge. The communication discipline includes both verbal and nonverbal messages. A body of scholarship all about communication is presented and explained in textbooks, electronic publications, and academic journals. In the journals, researchers report the results of studies that are the basis for an everexpanding understanding of how we all communicate. Communication happens at many levels (even for one single action), in many different ways, and for most beings, as well as certain machines. Several, if not all, fields of study dedicate a portion of attention to communication, so when speaking about communication it is very important to be sure about what aspects of communication one is speaking about. Definitions of communication range widely, some recognizing that animals can communicate with each other as well as human beings, and some are more narrow, only including human beings within the parameters of human symbolic interaction.Nonetheless, communication is usually described along a few major dimensions: Content (what type of things are communicated), source, emisor, sender or encoder (by whom), form (in which form), channel (through which medium), destination, receiver, target or decoder (to whom), and the purpose or pragmatic aspect. Between parties, communication includes acts that confer knowledge and experiences, give advice and commands, and ask questions. These acts may take many forms, in one of the various manners of communication. The form depends on the abilities of the group communicating. Together, communication content and form make messages that are sent towards a destination. The target can be oneself, another person or being, another entity (such as a corporation or group of beings).Communication can be seen as processes of information transmission governed by three levels of semiotic rules:Syntactic (formal properties of signs and symbols), pragmatic (concerned with the relations between signs/expressions and their users) and semantic (study of relationships between signs and symbols and what they represent). Therefore, communication is social interaction where at least two interacting agents share a common set of signs and a common set of semiotic rules. This commonly held rule in some sense ignores autocommunication, including intrapersonal communication via diaries or self-talk.In a simple model, information or content (e.g. a message in natural language) is sent in some form (as spoken language) from an emisor/ sender/ encoder to a destination/ receiver/ decoder. In a slightly more complex form a sender and a receiver are linked reciprocally. A particular instance of communication is called a speech act. In the presence of ＂communication noise＂ on the transmission channel (air, in this case), reception and decoding of content may be faulty, and ...

parameters这个单词是什么意思？

parameter [pE5rAmitE] n.参数， 参量， 起限定作用的因素 parameter pa.ram.e.ter AHD:[p…-r2m“1-t…r] D.J.[p*6r#mit*] K.K.[p*6r#m!t+] n.（名词） Mathematics 【数学】 A constant in an equation that varies in other equations of the same general form, especially such a constant in the equation of a curve or surface that can be varied to represent a family of curves or surfaces.参数，参量：在相同一般类型的等式中取值变化的等式中的常数或常量，尤其是曲线方程和平面方程中能代表一类曲线或平面的常量 One of a set of independent variables that express the coordinates of a point.变量，参数：一组代表与之对应的点的独立变量之一 One of a set of measurable factors, such as temperature and pressure, that define a system and determine its behavior and are varied in an experiment.要素，测量元素之一：一组可测量的确定某一系统并决定该系统的状况且在实验中是变化的因素之一，例如温度和压力 Usage Problem A factor that restricts what is possible or what results：【用法疑难】 限制因素：限定可能性和结果的因素：“all the parameters of shelter—where people will live, what mode of housing they will choose, and how they will pay for it”(New York) “住宿的所有限制因素——人们住在哪里、他们将选择什么样的住房式样以及他们如何付房钱”（纽约） A factor that determines a range of variations; a boundary：决定变数范围的要素，范围，界限：决定变化范围的因素；限度：an experimental school that keeps expanding the parameters of its curriculum.一所不断扩展课程范围的实验学校 Statistics A quantity, such as a mean, that is calculated from data and describes a population.【统计学】 母数：一种如平均数等从数据中计算出来的用来描述总体的数值 Usage Problem A distinguishing characteristic or feature.【用法疑难】 特色，特征：区别于其它事物的特点或性质 New Latin parametrum [a line through the focus and parallel to the directrix of a conic] 现代拉丁语 parametrum [通过焦点并与圆锥曲线的准轴线平行的直线] Greek para- [beside] * see para- 1 希腊语 para- [在旁边] *参见 para-1 Greek metron [measure] * see -meter 希腊语 metron [测量] *参见 -meter par”amet“ric AHD:[p2r”…-mμt“r1k] 或 par”a.met“ri.cal （形容词） par”amet“rically adv.（副词） In recent years parameter has become the archetype for the borrowing of scientific terms into general usage and as such has occasioned a good deal of skeptical comment. Some of its new uses can be justified as useful extensions of the technical senses of the word. For example, the provisions of a zoning ordinance that limit the height or density of new construction can be reasonably likened to mathematical parameters that establish the limits of other variables. Therefore one can properly say The zoning commission announced new planning parameters for the historic Lamping district of the city. But other uses suggest that the writer has not understood the technical sense and has chosen it primarily as a way of injecting an aura of scientific precision into what would otherwise be a pedestrian communication. Thus there is no semantic justification for using parameter as a general substitute for characteristic, as in The Judeo-Christian ethic is one of the important parameters of Western culture, an example found unacceptable by 80 percent of the Usage Panel. · Some of the difficulties with nontechnical use of parameter appear to arise from its resemblance to the word perimeter, with which it shares the sense “limit,” though the two words differ in their precise meaning. This confusion doubtless explains the use of parameter in a sentence such as U.S. forces report that the parameters of the mine area in the Gulf are fairly well established, where the word perimeter would have expressed the intended sense more exactly. This example of a use of parameter was unacceptable to 61 percent of the Usage Panel. 近些年来，parameter 已成为一个从科技术语借用到普通用法的原形， 同时也引起了大量的怀疑批评。

它的某些新用法可被看作是该词科技含义的有益扩展。

例如，某一区域性法规中关于新建筑高度或密度的条文能被合理地与制定其它变量限度的数学参量进行比较。

因而，人们当然可以说地区委员会公布了历史上该城有名的灯区新计划方案 。

但其它的一些用法说明说话人还没有理解它的科技含义，并且选用了这个词主要作为给将是普通交流的东西注入一些精确的科学气息的途径。

因此，用parameter 作为 characteristic 的一般等价词毫无语义上的合理性， 如在犹太教与基督教的道德规范是西方文化中重要的限制因素 ， 是80%的用法小组成员不接受的例子。

Parameter 的非科技运用中的一些难点是由于它与 perimeter 都有“限制”的含义造成的， 尽管两...