“加冠”与“免冠”——初中英语冠词用法概述

<正>冠词常用在名词前,帮助说明名词所指的人或物,它是一种虚词。冠词包括定冠词和不定冠词两类:定冠词,即the,用于指定的人或物;不定冠词用于泛指事物的类别,只有a和an两个。不少学生总感到冠词难用,尤其拿不准什么时候要"加冠",什么时候要"免冠"。现将冠词的用法简述如下:1.不定冠词a(an)的基本用法     

浅谈英语中定冠词的几种用法

<正>1冠词概述冠词(Article)是一种虚词,本身不能独立使用,只能附着在一个名词上帮助说明这个名词的含义。当代语法把冠词分为不定冠词、定冠词和零冠词三种。不用冠词即零冠词。2冠词的表意功能冠词的表意功能可以归纳为两种,即类指和特指。2.1类指类指是泛指一类人或物。定冠词与单数可数名词搭配,可起类指的作用,常用于正式语体。例如:Galileo claimed that he had invented the telescope.     

Refurbishment of Significant Timber Structures in Slovakia

The paper presents an analysis and a subsequent refurbishment of significant buildings in Slovakia. The analysis focuses on the load-bearing timber roof-structures. There are three sacral objects and one long-span sporting hall presented. The paper tries to introduce the background of difficult refurbishment process. Before the refurbishment, a thorough process of investigation is required This process includes four basic steps. General information about the load-bearing structure is obtained from the geodetic survey that foregoes the process of diagnostic inspection. The diagnostic survey focuses on the defects of the structure, their degree and possible origin. Modem methods of computer modelling help to understand the structural operation and help to find reserves of carrying capacity. Structural analysis should take into account all detected defects and the joint types, which can influence the transfer of forces. The refurbishment project is usually a brief, but clear summary for fulfilling the needs of Monument Board and building process. All the steps require knowledge from different fields and require professional approach.     

名词常见用法揭秘

<正>名词是指人或事物的名称。总的来说,名词分为专有名词和普通名词两类。专有名词是个别的人、事物、地点等专用的名称,如:Gina,China。专有名词的第一个字母要大写。名词按其所表示的事物的性质分为可数名词和不可数名词。可数名词有复数形式,如:an apple→two apples,a bag→some bags。不可数名词一般没有复数形式,如:milk,bread,rice。还有一些词既可以充当可数名词,也可以充当不可数名词,如:ice-cream,salad,chicken。     

Influence of zeolite and cement additions on mechanical behavior of sandy soil

It is well known that the cemented sand is one of economic and environmental topics in soil stabilization.In this instance,a blend of sand,cement and other materials such as fiber,glass,nanoparticle and zeolite can be commercially available and effectively used in soil stabilization in road construction.However,the influence and effectiveness of zeolite on the properties of cemented sand systems have not been completely explored.In this study,based on an experimental program,the effects of zeolite on the characteristics of cemented sands are investigated.Stabilizing agent includes Portland cement of type Ⅱand zeolite.Results show the improvements of unconfined compressive strength(UCS) and failure properties of cemented sand when the cement is replaced by zeolite at an optimum proportion of 30%after 28 days.The rate of strength improvement is approximately between 20%and 78%.The efficiency of using zeolite increases with the increases in cement amount and porosity.Finally,a power function of void-cement ratio and zeolite content is demonstrated to be an appropriate method to assess UCS of zeolite-cemented mixtures.     

Failure pressure calculation of fracturing well based on fluid-structure interaction

Failure pressure is a key parameter in reservoir hydrofracturing operation. Existing analytical methods for calculating the failure pressure are based on the assumption that borehole fluid is under two extreme conditions: non-infiltration or complete infiltration. The assumption is not suitable for the actual infiltration process, and this will cause a great error in practical calculation. It shows that during the injection process, the dynamic variation in effective stress-dependent permeability has an influence on the infiltration, and the influence also brings about calculation errors. Based on the fluid-structure interaction and finite element method (FEM), considering partial infiltration during injection process, a numerical model for calculating rock failure pressure is established. According to the analysis of permeability test results and response-surface method, a new variation rule of rock permeability with the change of effective stress is presented, and the relationships among the permeability, confining pressure and pore pressure are proposed. There are some differences between the dynamic value of permeability-effective-stress coefficient observed herein and the one obtained by the classical theory. Combining with the numerical model and the dynamic permeability, a coupling method for calculating failure pressure is developed. Comparison of field data and calculated values obtained by various methods shows that accurate values can be obtained by the coupling method. The coupling method can be widely applied to the calculation of failure pressure of reservoirs and complex wells to achieve effective fracturing operation.     

新目标英语八年级(下)重点词汇解读

<正>【名词】(1)message意为"消息;信息;口信"。give sb.a message给某人一个口信;take a message for sb.替某人捎个口信;leave a message for sb.给某人留个口信。(2)room作可数名词,意为"房间";作不可数名词,意为"空间",相当于space。例:There is no room on the bus.公共汽车上没有空地方了。(3)pair通常指成对出现的物品。a pair of意为"一双(副)……",后面接复数名词。如:a pair of shoes/socks/glasses一双鞋子/袜子/一副眼镜。     

The Mega-Cities in China: Development, Problems and Prospect

The existence of large and very large cities is a worldwide phenomenon. and has beena subject of much research and concern, The potentiai difficulty in tackling the issue isnow well understood. The number of large and very large cities is the greatest in China: there aretwenty-eight cities of 50,000 to one million population, and thirty of over one million, thelatter being regarded as meg-citics. There are nine of over two million population,amongst which Beijing has 10.4 million(1990)and Shanghai has 12.8 million(1990).Planning and research of the mega-cities tend to be locally specific and what is lackingseems to be an overview of the common and general issues in their development.     

THE FATE OF YOUNG BLACKS IN HARLEM

This article is based on the reading of an autobiography by a young blackman named Claude Brown. The name of the book is"Manchild in the PromisedLand." It describes the lives of young blacks in Harlem, New York City. There are many figures in this book. From them, we can see that it washard for young blacks to survive in Harlem. Claulde Brown was lucky and hewas an exception. His brother, Pimp, and many others were not.     

新目标英语七年级(下)重点语法聚焦

<正>There be结构there be意为"某处有某物"。如:There is a park in front of our school.我们学校前有个公园。there be结构表示"某地存在某物或某人"。它的基本句式为:there be+主语(名词)+地点状语,其中there是引导词,本身无词义,也不发生变化,而真正的主语是后面的名词,相当于:主语(名词)+be+地点状语。如:There is a restaurant next to the park.紧挨着公园有个饭店。there be结构的一般疑问句只需把be动词提前,回答时根据主语变化用Yes,there is/