Units 9—12重难点正误例析

Unit 9 1.他是一个经常说谎的人。房间里根本没有人。误:He is a people who tells lies.There is no person in the room at all.正:He is a person who tells lies.There is nobody in the room at all.     

校园枪击何时休?

33 dead in Virginia Tech shootings弗吉尼亚理工大学血案In the deadliest mass shooting in U.S.history,at least33people were killed in two separateattacks Monday at Virginia Tech,with33-including the suspected gunman-dying in onecampus building,police and university officials said.Two people were killed in the first shooting at about7:15a.m.at West Ambler Johnston Hall,     

Everyone Deserves Our Respect

<正>生活中，每个人都值得我们去尊重。你尊重人，也会因此获得他人的尊重。One day, a friend invited us to help serve dinner at Tent City. A number of tents were set up for the homeless in the area. I took my two boys with me. They were 9 and 5 at the time. They had a lot of questions about how poor people lived in the world.     

Wear behavior of copper-containing ferritic iron under a dry sliding condition

The effect of solute Cu and Cu precipitates on the wear behavior of ferritic iron under an unlubricated condition was investigated. The specific wear rate of Cu-containing steel abruptly decreased up to 50 N of load, and then gradually decreased with further increased load. The specific wear rate of the as-quenched specimen, in which Cu was in a solid solution, was the lowest among all the specimens at low loads, and all specimens had almost the same specific wear rate at high loads. Subsurface observation showed that the hardness increments of all specimens decreased with increased depth below the worn surface. The as-quenched specimen had a relatively large depth of deformed region than the other specimens even though the increments in hardness were almost the same for all specimens at low loads. With the same hardness at an unworn state, the as-quenched and over-aged specimens exhibited a substantial increase in hardness and large deformed regions below the worn surfaces. This finding indicated that the enhancement in plastic deformation and work hardening led to the decrease in the specific wear rate of the as-quenched specimen at low loads and the improvement in the wear resistance of all specimens at high loads.     

新目标英语七年级(上)Unit 4词语过关

在英语中,介词虽然不多,但是十分活跃,各有其自己的意思和固定搭配。本单元主要学习表示地点的介词,现在总结归纳如下:1.at,in,on的用法1)at用于较小的地方。例如:at the door(在门口);at the station(在车站);at the post office(在邮局);at home(在家);at school(在学校);at the library(在图书馆);at the book store(在书店)2)街道有号码时用at,无号码时用on。例如:He lives on Park Street.他住公园街。He lives at66Park Street.他住公园街66号。3)in表示较大的场所,若表示“在……内”,可以用于小地方。例如:in Beijing(在北京);in Asia(在亚洲)in the garden(在花园);in the open field(在露天);in the backpack(在背包里)4)当两个地名连用时,大的地名用in,小的地名用at。例如:He arrived at NewYork in America.他抵达美国的纽约市。5)on表示“与……表面...     

Experimental and thermal stress investigation on side wall deformation at the pendent convective pass in a utility boiler

An experimental investigation is performed on side wall deformation at the pendant convective pass （PCP） in a 300 MW and a 600 MW utility boiler. The temperature distributions are measured on the side wall areas of the water-cooled wall, the PCP and the horizontal convective pass （HCP） in the two utility boilers. These experiments show that there are great temperature differences in the side wall areas during the startup process in both utility boilers. These temperature differences can reach 80-150 ~C with the side wall temperature in the PCP area higher than those in the water-cooled wall and the HCP. The highest temperature in the PCP is close to the flue gas side temperature at the same position in the horizontal flue gas pass. Thermal stress analyses are conducted in the side wall areas in the water-cooled wall, the PCP and the HCP with the software ANSYS. The results show that, at great temperature differences, the PCP side wall undergoes negative thermal stresses that exceed the yield strength causing deformation in the PCP side wall.     

信鸽往来

问:有这样一道选择题: The dean is having ameeting. But you can wait here.The meeting will be over. A. in a moment; for a moment;at the moment B.for a moment; in a moment; at the moment C. at the moment; for a moment; in a moment     

阅读 理解 训练(英文)

一、阅读短文判断正误Most of England and Wales will have a cold,dry day.It will be sunny at times.There will be alittle rain in the afternoon.The wind will be weakin the east,but quite strong in the west.At nightthe temperature will stay above zero in most partsof the southeast and Midlands.But in the north,the west and Wales,the temperature will fallbelows zero.In most parts of Scotland,the temperature willbe above zero in the day.But at night it will fallbelow zero again,and the roads wil…     

Communicative Language Teaching in the English Classroom

The communicative approach is very much in vogue at present both at home and abroad.This paper,while discussing the problems that exist in the English classrooms in China,focuses on the factors that influence the communication between people not only of different cultures but also of different genders,professions,and ages etc.And the author discusses the communicative language teaching methods in the English classroom.This paper analyzes the communicative approach mainly from three perspectives,linguistic,psycholinguistic,and the pragmatic perspective.And the author analyzes the factors that influence the communication between people mainly in classroom.     

大卫·贝克汉姆

David Beckham was born May 2,1975,in England. One of the most renowned footballers in England and pro athletes in the world,he was signed by Manchester United at the age of 14. He began his soccer career at the age of 17 and play for the Manchester United football team.In the 2003,Beckham signed a 4-years contract with Real Madrid. This year,Spanish newspaper reported that Beckham is expected extend his contract at Real Madrid by two years till 2009.The Beckhams announced the birth of t…     

On Jane Eyre’s Rebellious Spirit

It attempts to discuss the rebellious spirit of the heroin in Charlotte Bronte’s novel Jane Eyre through the analysis in four periods of her experiences: childhood at Gate shed; girlhood in Lo wood charity; adolescence in Thorn field,and maturity at Fern dean. Her special character is developed step by step.     

The Death of Aestheticism

As a trend of thought in literature and art,aestheticism rose suddenly at the end of the 19th century and withered away soon.It was just like a flash in the world of literature and art.One of the initiators,Oscar Wilde,has been noticed with great attention by the critics.Wilde earnestly practiced the aestheticism he advocated.Some of his acts were cast aside by the moral in his time,which at last led to his death in a strange land.     

Louise Duffield Cummings

1870- 1947 Louise Cummings was born in Hamilton, Ontario. Her early education was obtained in the public schools and Collegiate Institute at Hamilton. She received her B.A. (1895) with First Class Honors in Mathematics from the University of Toronto. The year 1895-96 was spent in graduate study under the direction of Professor DeLury of Toronto University. In 1896-97 Cummings held a fellowship in mathematics at the University of Pennsylvania, and the following year she was a student i…     

My Busy Day

I'm a middle school student.I'm 13 years old.I'm very busy every day.I must get up at half past five in the morning.I have breakfast at six and go to school at half past six.School starts at six forty-five.I have four classes in the morning.I have lunch at 12     

小学毕业复习指导与检测——英语 英语综合测试卷(三)(英文)

一、听力部分 11听音 ,用指针标出你所听到的时间 。 21听音 ,给下列句子排顺序 。 ( )I usually domy homework at8∶00 in the evening. ( )I eatmy dinner at6∶30 in the evening. ( )I getup at6∶30 in themorning. ( )I go to school at7∶20 in themorning. ( )I go to     

The First Olympic Gold Medallist of China from the Track and Field

Liu Xiang,a 21-year-old Chinese athlete,got the gold medal of the fascinating men's 110 mhurdles(跨栏)before a crowd of 70,000 at the Olympic Stadium in the 28th Olympics in Athens late Friday local time.He clocked an excellent 12.91 seconds to equal the world record set by Britain's Collin Jackson in 1993.Terrence Trammell of the United States,silver medallist at both the Sydney Olympics and last year's world championships,won the silver in 13.18.Anier Garcia of Cuba took the bronze in…     

英语小幽默

One Point Hanging in the hallway at Whites HighSchool in Wabash,Ind.,and the basketballteam pictures from the past 40 years.Aplayer in the center of the front row in eachpicture holds a basketball identifying the year-”62-63”,”63-64”,”64-65”,etc.One day I spotted a freshman looking curi-ously at the photos.Turning to me,he said,”Isn’t it strange how the teams always lostby one point?”     

Infrared Absorption Spectra of Serpentine Cat＇s Eye from Sichuan Province of China

Infrared （IR） absorption spectra and X-ray powder diffraction （XRD） patterrns of sexpenfine cat＇s eye from Sichuan Province have been investigated, and infrared absorption bands of the serpentine have been assigned in this paper. The results indicate that the bands near 3 600 - 3 700 cm^-1 belong to the stretching absorption band VOH, the bands in 948 - 1 100 cm^-1 axe assigned to the stretching vibraling band Usvo, and the bands at 600 570 and 440 cm^-1 respectively belong to the bending vibration band VOH, δMg-O and δSi-O. The serpentine cat＇ s eye includes two types： chrysotile and antigorite. Chrysotile has a sharp and intensive band at 3 688 cm^-1 and a weak band at 3 643 cm^-1 , while antigorite has only one intensive band in the region. At vibration band VSi-O, chrysotile and antigorite have a similar feature at 1 071 cm^-1, but the band at 980 cm^-1 in anfigorite has been split into two bands in chrysotile - a strong one at 1 027 cm^-1 and a weak one at 949 cm^-1. In addition, antigorite has a characteristic bending vibrating band δMg-O at 570 cm^-1. Based on the analysis of the feature of crystal structure, their IR differences axe well explained.     

星光灿烂小小罗

Ronaldo　was　born　in　Funchal　in　the　Madeira　Islands　where　he　started　his　career　at　Nacional　beforemoving　to　Sporting　Lisbon.He　made　his　debut　for　Sporting　in　the　Portuguese　Super　Liga　in　September　2002　at　the　age　of　justseventeen.Cristiano　caught　the　attention　of　many　—United　players　included　—during　the　pre-season　friendlywhich　marked　the　opening　of　Sporting誷　new　stadium,　a　game　in　which　Ronaldo　scored.　The　Reds　manage-m…     

Simple operated multipurpose temperature control cryostat

A suitable simple optical cryostat for optical, magneto-optical, electrical and thermo-electrical measurements was designed. It is suitable for use in a magnetic pool gap as narrow as less than 1 cm. Throughout a long period of time, the heat diffusion process of the cryostat can be easily operated at slow increase in sample temperature in a range 1.25 K/min at 200 K that will be reduced gradually to 0.66 K at room temperature. Liquid nitrogen was used to cool down the temperature. During the operation, the change in the measured energy gap of a semiconductor sample and other physical parameters resulting from the change of temperature can be corrected through the temperature coefficient of that parameter at the corresponding temperature. The cryostat was successfully used for all experiments mentioned above to measure the properties of a single crystal of GaP (Gallium Phosphate) semiconductor.