- 沙尘暴如何形成 英语作文60词
- 英语翻译Soft
- 英语翻译3、当烟尘袭来时,用湿毛巾或衣服捂住口鼻迅速躲避.躲避不及时,应选在附近没有的平地卧地避烟.切切不可选择低洼地或坑、洞,因为低洼地和坑、洞容易沉积烟尘. 4、如
- 求高人 帮忙翻译 起重机桥式抓斗起重机是桥架在高架轨道上运行,由起重小车带动抓斗抓取物料的一种桥架型起重机.桥架沿铺设在两侧高架上的轨道纵向运行,起重小车沿铺设在桥架上的轨
- 地震的危害,形成等,用英语说,用来做小报
沙尘暴如何形成 英语作文60词
沙尘暴的形成需具备4个条件.
一是地面上的沙尘物质.它是形成沙尘暴的物质基础.
二是大风.这是沙尘暴形成的动力基础,也是沙尘暴能够长距离输送的动力保证.
三是不稳定的空气状态.这是重要的局地热力条件.沙尘暴多发生于午后傍晚说明了局地热力条件的重要性.
四是干旱的气候环境.沙尘暴多发生于北方的春季,而且降雨后一段时间内不会发生沙尘暴是很好的证据.
春季沙漠的边缘地区,由于长期干旱,而且地表少有植被覆盖,当有大风来临的时候地表的沙尘很容易被吹起且被输移,但由于沙子粒径较大,不易形成悬移(悬浮移动,是小颗粒物质保证长距离输移的必要条件),因此不能长距离输移,这也是距沙尘较远的地区只有降尘而少见扬沙的主要原因.如果风持续的时间很长,形成悬移的浮尘能够被输送到很远的地方,所经过的地区就会出现沙尘暴；当风速减弱到一定程度后,浮尘就会降落,该地就会出现降尘天气.如果此时降水,就会形成所谓的“泥雨”.
从沙尘暴形成过程所需的4个条件看,黄土高原、广袤的沙漠及由人为因素的破坏正处于荒漠化过程中的土地,北方春季末耕种的土地及处于施工过程中的基础设施(如高速公路等)为沙尘暴的发生提供了充分的物质源；而春季北方地区的干旱,又使沙尘暴发生的可能性增强；大风的产生是一种复杂的大气现象,主要是冷锋活动或经纬向环流调整作用的结果.由此可见沙尘暴的产生是多种复杂因素共同作用结果,人类活动对自然界的破坏导致土地荒漠化的加剧,对沙尘暴发生产生了极其重要的作用,而近几年全球干旱(其原因目前尚未知)等异常天气现象也对沙尘暴的发生起了不可估量的作用.所以说人类活动对沙尘暴的产生只起到一定作用,并不能说沙尘暴就是人为因素造成的.
The formation of the sandstorm to have the four conditions.
One is the dust on the ground material.It is the material basis of form sandstorm.
2 it is winds.This is the power of the formation,is fundamental to the power of the sandstorm long-distance transport of guarantee.
Three is not stable air condition.This is an important local thermal conditions.Sandstorm occurs more often in the afternoon that incorporates the evening the importance of thermal condition.
Four is the dry weather environment.Born in the north of the sandstorm multiple spring,and rain after a period of time within a won't happen very good evidence is dust storms.
The edge of the desert in the spring,due to long drought,and surface vegetation cover,when there is little wind comes on the surface of the earth is easy to be blowing dust and sand,but due to lose move large particle size,is formed not easily movable (suspension movement,it is small particle material guarantee to lose the necessary conditions of long distance move),and therefore can not move long lost,this is far from the dust in the dust and rare only micrometeorology main reason.If the wind last time is very long,form the dust suspended loads can be transported to a very far place,through which areas will appear sandstorm; When the winds weaken to certain degree,floating dust will the landing,the dust weather will appear.If the precipitation,can form the so-called "NiYu".
The formation process from the four conditions look,the loess plateau and vast desert and by the destruction of the human factors in the process of desertification is in the land of the north,at the end of the spring farming land and in the construction process of infrastructure (such as high speed road,etc.) for the dust storm occurrence providing full source material; And the spring drought in the north,and the likelihood of the sandstorm strengthened; The winds generated is a complex phenomenon,mainly is the cold air activities or to the circulation of the regulatory role longitude results.This shows the generation of sandstorm is DuoZhong complex factors results of human activity on the natural world to disruption of the desertification intensifies,dust storms happen to have an important role,and in recent years the global drought (the cause isn't yet known) weather phenomenon also to the dust storm occurrence have played an important role.So that human activities for the generation of dust storms only play a role,and can't say dust storms are caused by human factors.
英语翻译Soft
Soft-ground隧道掘进高线驱动的全部或大部分是通过柔软的材料.在很松软的地面,很少或根本没有爆破是必要的,因为这个材料容易挖掘.
起初,forepoling是唯一的方法,为建设隧道通过地面很软很重的厚木板.Forepoles大约5英尺(1.5米)长,加剧了一点.他们被注入到顶部单杠的支撑的面部隧道.当时的forepoles赶进了地面的脸和外表的心理倾向.毕竟屋顶极点被他们的大约一半的长度,木材被横穿他们结束针对任何紧张暴露在外面的结束.由此提供了foreples隧道支护的一种扩展,脸部延长下面去.当两端的forepoles达成的协议,支持,加入了新的理性化和forepoles被赶进了地面下前进的隧道.
使用压缩空气简化工作在松软的地面.建立了一种防范,通过这个人和设备通过了,和充足的空气压力维持在隧道举办地面公司面临的理性化开挖过程直到第一座架设或另外的支持.
英语翻译3、当烟尘袭来时,用湿毛巾或衣服捂住口鼻迅速躲避.躲避不及时,应选在附近没有的平地卧地避烟.切切不可选择低洼地或坑、洞,因为低洼地和坑、洞容易沉积烟尘. 4、如
3.When the smoke hit, with wet towels or clothes to cover your mouth and nose to avoid the rapid. Not escape in time, should not in the vicinity of combustible material lying on the ground to avoid sm...
求高人 帮忙翻译 起重机桥式抓斗起重机是桥架在高架轨道上运行,由起重小车带动抓斗抓取物料的一种桥架型起重机.桥架沿铺设在两侧高架上的轨道纵向运行,起重小车沿铺设在桥架上的轨
Grab bridge bridge crane is running on the elevated track,the car driven by the lifting of materials crawl grab a bridge-crane.Bridge laying on both sides along the elevated track on the vertical run,lifting trolley along the bridge in laying the track on the horizontal run,a rectangular scope of work,you can make full use of space below the bridge lifting material from Ground equipment hindered.Grab bridge cranes widely used in power plants,Mei Chang,and other needs of bulk material handling of the occasion,because of the heavy equipment,transportation difficulties installation,testing the quality of their products in general need in the field.Therefore,control equipment requirements for wiring,small size and portability.And the use of fixed-site conditions,also called a random testing equipment manual control functions to ensure the safety of operation.With the lifting of the transport requirements of the mechanical control continuously improve,more and more advanced means of control.At present the domestic bridge crane control system requires people at the scene to control,control methods are backward.In small and medium-sized crane,the most direct control over the use of controllers,car running,Lord,vice hook upgrade,dropped weights and speed.
This paper is designed to bridge crane grab the electrical control system,application access control system control relay.Details on the relays,contactors and the cam controller choice.A limit over-current,low voltage,and other protection.Limit limit switches through the role of good for the entire operation of cranes in the process of security.All the control process can be completed in the indoor driving.A higher degree of automation system as a whole,stable and reliable operation,maintenance phase convenience.
地震的危害,形成等,用英语说,用来做小报
An earthquake (also known as a tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves.Earthquakes are recorded with a seismometer,also known as a seismograph.
Tectonic earthquakes will occur anywhere within the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane.In the case of transform or convergent type plate boundaries,which form the largest fault surfaces on earth,they will move past each other smoothly and aseismically only if there are no irregularities or asperities along the boundary that increase the frictional resistance.Most boundaries do have such asperities and this leads to a form of stick-slip behaviour.Once the boundary has locked,continued relative motion between the plates leads to increasing stress and therefore,stored strain energy in the volume around the fault surface.This continues until the stress has risen sufficiently to break through the asperity,suddenly allowing sliding over the locked portion of the fault,releasing the stored energy.This energy is released as a combination of radiated elastic strain seismic waves,frictional heating of the fault surface,and cracking of the rock,thus causing an earthquake.This process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the Elastic-rebound theory.It is estimated that only 10 percent or less of an earthquake's total energy is radiated as seismic energy.Most of the earthquake's energy is used to power the earthquake fracture growth or is converted into heat generated by friction.Therefore,earthquakes lower the Earth's available elastic potential energy and raise its temperature,though these changes are negligible compared to the conductive and convective flow of heat out from the Earth's deep interior.
Effects/impacts of earthquakes
There are many effects of earthquakes including,but not limited to the following:
Shaking and ground rupture
Shaking and ground rupture are the main effects created by earthquakes,principally resulting in more or less severe damage to buildings or other rigid structures.
Landslides and avalanches
Landslides are a major geologic hazard because they can happen at any place in the world,much like earthquakes.Severe storms,arthquakes,volcanic activity,coastal wave attack,and wildfires can all produce slope instability.Landslide danger may be possible even though emergency personnel are attempting rescue.
Fires
Fires of the 1906 San Francisco earthquakeFollowing an earthquake,fires can be generated by break of the electrical power or gas lines.
Soil liquefaction
Soil liquefaction occurs when,because of the shaking,water-saturated granular material (such as sand) temporarily loses its strength and transforms from a solid to a liquid.
Tsunami
Tsunamis are long-wavelength,long-period sea waves produced by an sudden or abrupt movement of large volumes of water.
Floods
Earthquakes may cause landslips to dam rivers,which then collapse and cause floods.
Human impacts
Earthquakes may result in disease,lack of basic necessities,loss of life,higher insurance premiums,general property damage,road and bridge damage,and collapse of buildings or destabilization of the base of buildings which may lead to collapse in future earthquakes.
Earthquakes can also lead to volcanic eruptions,which cause further damages such as substantial crop damage,like in the "Year Without a Summer" (1816).
