pi是什么意思
pi在不同的场景有不同的含义，以下是几种常见的解释：1.pi是国际单位制中的压强单位，表示压力的大小。2.pi是圆周率，是一个无理数，即无限不循环小数。3.pi是概率论中的随机变量，表示一个事件发生的可能性。4.pi是工程上的常用单位帕斯卡，表示压强的大小。5.pi是国际货币基金组织的缩写，其英文全称为SpecialDrawingRight，是一种专门针对国际储备货币发行国的官方货币。6.pi是计算机科学中的进制转换器，可以将十进制数转换为二进制数或八进制数。7.pi是内切圆半径，圆柱体侧面的最大内接圆的直径，即底面圆的直径。希望上述信息能帮助到您，如果还有其他问题，请随时告诉我。【摘要】
pi是什么意思【提问】
pi在不同的场景有不同的含义，以下是几种常见的解释：1.pi是国际单位制中的压强单位，表示压力的大小。2.pi是圆周率，是一个无理数，即无限不循环小数。3.pi是概率论中的随机变量，表示一个事件发生的可能性。4.pi是工程上的常用单位帕斯卡，表示压强的大小。5.pi是国际货币基金组织的缩写，其英文全称为SpecialDrawingRight，是一种专门针对国际储备货币发行国的官方货币。6.pi是计算机科学中的进制转换器，可以将十进制数转换为二进制数或八进制数。7.pi是内切圆半径，圆柱体侧面的最大内接圆的直径，即底面圆的直径。希望上述信息能帮助到您，如果还有其他问题，请随时告诉我。【回答】
pi是什么？
1、圆周率（圆的周长与直径的比值）圆周率（Pi）是圆的周长与直径的比值，一般用希腊字母π表示，是一个在数学及物理学中普遍存在的数学常数。π也等于圆形之面积与半径平方之比，是精确计算圆周长、圆面积、球体积等几何形状的关键值。在分析学里，π可以严格地定义为满足sinx=0的最小正实数x。2、获利指数获利指数（PI），是指投产后按基准收益率或设定折现率折算的各年现金流入量的现值合计与原始投资的现值合计之比。3、PI数据库pi（Plant Information System）是由美国OSI Software公司开发的一套基于Client/Server结构的商品化软件应用平台，是过程工业全厂信息集成的必然选择。意义：把圆周率的数值算得这么精确，实际意义并不大。现代科技领域使用的圆周率值，有十几位已经足够了。如果以39位精度的圆周率值，来计算可观测宇宙（observable universe）的大小，误差还不到一个原子的体积。以前的人计算圆周率，是要探究圆周率是否循环小数。自从1761年兰伯特证明了圆周率是无理数，1882年林德曼证明了圆周率是超越数后，圆周率的神秘面纱就被揭开了。
在线翻译：中文翻译成英文
China is the world's largest coal production and consumption Country，and is also one of the few countries which regard coal as the main sources of energy ,the coal energy rates was very high among energy consumption structure rates in our country.Among them, most of the coal combustion for power generation and heating industry.For large coal-fired power station and boiler,Pulverized coal combustion is the main way of combustion.However, It's one of the most important factors which has restricted the sustainable development that the use of pulverized coal combustion efficiency is not high and the environmental pollution caused by burning of our country one of the most important factors.
Based on the coal combustion efficiency and low pollution comprehensive consideration," corona charged pulverized coal combustion mechanism and experiment research" is put forward.By means of high voltage electrostatic field on the solid particles and gas can produce electric charge effect,On one hand, the gas atoms or ions moving kinetic energy is very high,and when contact with the pulverized coal particles,it'll transferred part of energy to the coal particle surface, and lead to Particles in an unstable high-energy state , increased the particle surface activity; On the other hand, oxygen, carbon monoxide, corona methane gas ion, electron, has high energy, those make accelerate coal particle combustion reaction rate, reduce combustion reaction temperature become possible. However, in the actual production process of coal, coal is usually in a flow state. From theoretic analysis, the flow of pulverized coal combustion efficiency of pulverized coal is greater than under the static state, Therefore,the pulverized coal flow in charge of combustion enhancement is possible.
In this paper,on the basis of pulverized coal particles are charged successfully, through using of the original cyclone electrostatic charge system to build the pulverized coal flow injection charge combustion system. using a photographic record and analysis of its ignition and combustion state, using sampling thermal analysis method of burnout to exploring Charged pulverized coal flow combustion status.
Key words: corona discharge, the pulverized coal flow, combustion, thermal analysis
翻译了一会，还挺累，不说百分百准确，但是基本没什么大的语法错误，望采纳。
