介词短语的从句功能

中学生英语读写1.有的介词短语可用来表示时间，这种介词短语实质上起着状语从句的作用，它可以取代一个表示时间的状语从句。例如：At the age of twelve(=When he was twelve)，Edi-son began selling candy，sandwiches and newspapers on a train.(JBVI，P.66)／During the first hundred years of my stay in the sea(=When I stayed in the sea for the first hundred years)，I made a promise that if anyone set me free I would make him rich. (JBV，P.76)／The whole nation was plunged into deep sorrow at this news…     

高考短文改错题的错误类型

缺冠词 ①可数名词前缺冠词，不可数名词前缺定冠词。如：(a)lot of students／(the) Chinese．②比较级或序数词前缺冠词。如：(the) taller of the two／on July (the) first．     

Influences affecting the soil-water characteristic curve

INTRODUCTION The soil-water characteristic curve (SWCC) gives the relationship between the amount of water in the soil (i.e. gravimetric or volumetric water content) and soil suction (i.e. matric suction at low suction and total suction at high suction). Many properties of a partially saturated soil such as the coefficient of permeability, shear strength and volume strain, pore size distribution, the amount of water contained in the pores at any suction, can be obtained from the SWCC. …     

English Class Unit 3

你知道at的用法吗?介词(表示地点位置)在;在……请看以下常用短语:at the door 在门口at 104 Nanjing Roadat the bus stop在公共汽车站at home 在家at the end of...在……尽头at the head of... 在……前面     

Isolation and physiological characteristics of a premature senescence mutant in rice （Oryza sativa L.）

A rice pse(t) (premature senescence, tentatively) mutant line, was isolated from 4500 independent T-DNA inserted transgenic lines. The symptoms of premature senescence appeared more severely than those of the control plants (Zhonghua 11,japonica) at the last development stage. To characterize the mutant and provide basic information on the candidate genes by mapping to a physical region of 220-kb, experiments were carried out in two phytotrons under controlled temperature of 24 ℃ and28 ℃, respectively. The content of chlorophyll, soluble protein and MDA (malondialdehyde), net photosynthesis, the antioxidant enzyme activities of SOD (superoxide dismuase) (EC 1.15.1.1) and POD (peroxidase) (EC 1.11.1.7) and the peptidase activities of leaves were measured from top to bottom according to the leaf positions at the flowering stage. Compared with the control plant,the mutant showed the following characteristics: (1) Higher net photosynthesis rate (Pn) appeared in the 1 st and 2nd leaves, contents of chlorophyll and soluble protein were also higher in the 1 st leaf; (2) The activities of SOD, POD and peptidase were higher according to the leaf position from top to bottom; (3) The symptom of premature senescence was accelerated in the mutant at 28℃treatment. The MDA content and the SOD and POD activities between the 24 ℃ and 28 ℃ treatment mutants were not significantly different. Content of chlorophyll and soluble protein of leaves mutant decreased rapidly at 28 ℃ treatment. The results show that pse(t) is sensitive to high temperature. The probable function of PSE(T) is discussed.     

常见词语错用五例

1.不要把玻璃杯放在桌子角上. 误:Dont put the glass at the corner of the table. 正:Dont put the glass on the corner of the table. 析:当corner与介词in,on,at,round搭配时,有四种含义: (1)at the corner指在某物外部的角落上(拐角处).例如, The post office is at the corner of this street.     

Preparation of high-permeability NiCuZn ferrite

Appropriate addition of CuO/V2O5 and the reduction of the granularity of the raw materials particle decrease the sintering temperature ofNiZn ferrite from 1200℃ to 930 ℃. Furthermore, the magnetic properties of the NiZn ferrite prepared at low temperature of 930℃ is superior to that of the NiZn ferrite prepared by sintering at high temperature of 1200 ℃ because the microstructure of the NiZn ferrite sintered at 930℃ is more uniform and compact than that of the NiZn ferrite sintered at 1200℃. The high permeability of 1700 and relative loss coefficient tanδ/μi of 9.0-10^-6 at 100 kHz was achieved in the (Ni0.17Zn0.63Cu0.20)Fe 1.915O4 ferrite.     

Science Letters:Preparation of high-permeability NiCuZn ferrite

Appropriate addition of CuO/V2O5 and the reduction of the granularity of the raw materials particle decrease the sintering temperature ofNiZn ferrite from 1200 ℃ to 930 ℃. Furthermore, the magnetic properties of the NiZn ferrite prepared at low temperature of 930 ℃ is superior to that of the NiZn ferrite prepared by sintering at high temperature of 1200 ℃ because the microstructure of the NiZn ferrite sintered at 930 ℃ is more uniform and compact than that of the NiZn ferrite sintered at 1200 ℃.The high permeability of 1700 and relative loss coefficient tanδ//μi of 9.0×10-6 at 100 kHz was achieved in the (Ni0.17Zn0.63Cu0.20)Fe1.915O4 ferrite.     

射手和狮子

An Archer went up into the hills to have some sport with his bow (弓), and all the animals fled (逃走) at the sight of him with the exception of the Lion, who stayed behind and challenged (向……挑战)him to fight.The Archer shot an arrow at the Lion and hit him ,     

Study on the neurotoxic effects of low-level lead exposure in rats

Objective: To investigate effects of developmental lead exposure on nitric oxide synthase (NOS) activity in different brain regions and on N-methyl-D-aspartate (NMDA) receptor mRNA expression in the hippocampus of rats. On the basis of these observations, we explored possible mechanisms by which lead exposure leads to impaired learning and memorizing abilities in children. Methods: A series of rat animal models exposed to low levels of lead during the developing period was established (drinking water containing 0.025%, 0.05% and 0.075% lead acetate). NOS activities in the hippocampus, the cerebral cortex, the cerebellum and the brain stem were determined with fluorescence measurement and levels of mRNA expression of the NMDA receptor 2A (NR2A) subunit and NMDA receptor 2B (NR2B) subunit in the rat hippocampus were measured with Retro-translation (RT-PCR). Results: There were no differences in the body weight of rat pups between any of the groups at any given time (P>0.05). The blood lead level of Pb-exposed rat pups showed a systematic pattern of change: at 14 d of age, it was lower than that at 7 d of age, then rising to the peak level at 21 d and finally falling to lower levels at 28 d. The hippocampal NOS activities of lead-exposed groups were all lower than that of the control group on the 21st and 28th day (P<0.01). NOS activities in the cerebellum of lead-exposed groups were all lower than that of the control group on the 21st and 28th day (P<0.001) and the NOS activity of the 0.025% group was significantly lower than that of the 0.05% and 0.075% groups on the 28th day (P<0.05). NOS activity in the cerebral cortex of the 0.075% group was significantly lower than that of the control, 0.025% and 0.05% groups on the four day spans (P<0.001). There was no significant difference of NOS activity in the brain stem between any lead-exposed group and the control group on the four day spans. In the 0.05% and the 0.075% groups, the level of NR2A mRNA expression was higher than that in the control group at 7 d and 14 d of age (P<0.05). In the 0.025% group, the level of NR2A was found to be higher than that in the control group at 7 d of age only (P<0.05). No significant differences were found for the levels of NR2B mRNA expression between any of the groups at any given time. Conclusions: NOS activity in the hippocampus, the cerebral cortex and the cerebellum are inhibited by lead exposure. The degree of the inhibitory effect depends on the time span of exposure and the lead concentration. Developmental low-level lead exposure was found to raise the level of NR2A mRNA expression in the hippocampus of rats. Developmental low-level lead exposure does not affect the level of NR2B mRNA expression in the hippocampus.     

你能区分下列相似词组吗

at play在玩;at the play在看戏。behind time迟到;behind the times落在时代后。by day在白天;by the day按日计算。by sea乘船;by the sea在海边。in front of在……(外面的)前面;in the front of在……(内部的)前面。in charge of看护,负责;in the charge of由……看护,由……负责。     

A study on sampling strategies in the figure cognitive process

This study was aimed at investigating the sampling strategies for 2 types of figures: 3-D cubes and human faces. The research was focused on: (a) from where the sampling process started; (b) in what order the figures' features were sampled. The study consisted of 2 experiments: (a) sampling strategies for 3-D cubes; (b) sampling strategies for human faces. The results showed that: (a), for 3-D cubes, the first sampling was mostly located at the outline parts, rarely at the center part; while for human faces, the first sampling was mostly located at the hair and outline parts, rarely at the mouth or cheek parts, in most cases, the first sampling-position had no significant effects on cognitive performance and that (b), the sampling order, both for 3-D cubes and for human faces, was determined by the degree of difference among the sampled-features.     

看图巧记方位介词

英语中表示方位的介词很多,易于混淆。如果能巧妙地借助简笔画,就能化难为易,轻轻松松地掌握它们。40picture1e郾g—W here’s the ball?—It’s on(in、under、near、behind)the box.oninunderbehindneare郾gThe bus is com ing郾The driver is at the front of the bus郾(在……内部的前面)The wom an is at the back of the bus郾(在……内部的后面)The old m an is in front of the bus郾(在……外部的前面)The little girl is behind the bus郾(在……外部的后面)behind in front of穴in雪at the front ofat the back ofpicture2pic…     

阅读特训营

First Passage [1] For centuries mariners(水手) tried to find a deepwater route called the Northwest Passage. A northern lane between the Atlantic and Pacific would be shorter than the dangerous voyage rounding Cape Horn at the tip of South America. But ships vanished and men died. With its cold, blizzards(暴风雪) and ice, the Arctic defeated the searchers. [2] On the morning of August 11, 1775, the whaleship Herald lay becalmed(使平静) west of Greenland, at latitude(纬度) 76° north, near a vast sea of ice. By early     

名词性从句中常用连词及其常见错误简析

连接副词where在句中的作用相当于：where=(to／in／at)the place where，它不仅可以指地点，而且可以指工作、学习、生活的每一个方面。     

The Influence of Communicative Language Teaching on Teaching Material Development

Communicative Language Teaching(CLT) is the generally accepted norm in the field of second language teaching.The language teaching material design is influenced by the views of language and language teaching at the macro level,and restricted by specific syllabus at the micro level.     

具有“进行”意义的介词at,on

在英语中,介词at,on与名词构成介词短语作连系动词be的表语时,具有“进行”意义。如: 1．be+at／on+动作名词①A group of students are at play on the playground. =A group of students are playing on the playground.     

太空食品,让科学家梦想成真?(英文)

Somewhere at the bottom of the South Pacific, among the wreckage(残骸) of Russia's Mir space station, lies the miniature Bulgarian-built greenhouse where the first space wheat crop was harvested. The 1999 crop launched the era(时代) of growing food in space and     

单轴孪晶界面上的最大负折射角

Using the Maxwell's equations,we carry out theoretical analysis on the maximum incident and refractive angles at which negative refraction can be realized at the interfaces associated with conventional uniaxial media.In the numerical analysis,the largest incident and refractive angles at which refraction arises are obtained by optimizing directions of the optical axis of the uniaxial bicrystal.Meanwhile,the optical parameters of the ordinary uniaxial bicrystals (including homogeneity- junction and heterogeneity-junction) are given,and some representative laser wavelengths,the largest incident and refractive angles are obtained.The relation between the largest incident angles (or refractive angles) and refractive index is also discussed.     

圣诞快乐(英文)

Christmas was close at hand, in all his bluff(直率的)and hearty honesty; it was the season of hospitality, merriment and open-heartedness; the old year was preparing, like an ancient philosopher, to call his friends around him, and amidst the sound of feasting and revelry(狂欢) to pass gently and calmly away. Gay(快乐的) and merry was the time, and gay and merry were at least four of the numerous hearts that were gladdened by its coming.