首页
登录
职称英语
All competitive ski and snowboarding events now take place largely on man-ma
All competitive ski and snowboarding events now take place largely on man-ma
游客
2024-05-21
13
管理
问题
All competitive ski and snowboarding events now take place largely on man-made snow. Unlike its natural counterpart, the machine-made white stuff can be carefully tweaked to make a more durable and consistent surface: one perfect for record-breaking attempts. Snow-making equipment is viewed as essential in most ski areas to guarantee coverage throughout the season. Nowadays, "natural snow is a bonus," says Rich Brown of snow-making technology company York Snow in Victor, New York, whose systems were used in the 2002 Winter Olympics in Salt Lake City and previous games.
The snow "cannons" or "guns" that manufacture snow mimic the natural formation of snowflakes. Snow machines typically force pressurized water through a nozzle (喷嘴), breaking it into a mist of tiny droplets, and then use compressed air or fans to blast them into the air. As the droplets cool, the molecules line and crystallize into ice particles. The art to snow-making is adjusting the water and air to ensure that the water drops are small enough and sent far enough that they will freeze before they hit the ground. If the air temperature is quite high, for example, dropping the water content and upping the air would create smaller particles that are more likely to freeze. Snow-making machines also frequently incorporate nucleating agents (成核 剂) in the water: small quantities of materials such as bacterial protein, on to which the water molecules attach and freeze. By triggering freezing, these agents raise the temperature at which snow can be made.
Many resorts now use sophisticated computer systems that automatically adjust the air and water output from snow machines based on air temperature, humidity and wind, says Brown. For race courses, experts adjust man-made snow to create a tough, fast and icy course rather than a powdery one. A ski course is also heavily groomed and often intentionally flooded to create patches of ice; these factors generally determine the speed of a race.
There are other reasons for snow manufacturing to be in demand, beyond the benefits of having a snow whose properties can be ordered up. Some predict that the need for snow will rocket with the warming effects of climate change, which are already pushing snow lines up the Alps. But this comes with environmental costs, says Michel Revaz, of the International Commission for Protection of the Alps (ICPRA). Making snow chews up energy and water, and can rob rivers and creeks in the surrounding ecosystems. One way to conserve the mountain environment, Revaz says, would be to reuse winter sports competition facilities rather than building new ones. [br] The other reason for the increasing demand of man-made snow may be attributed to______.
选项
答案
the warming effects of climate change
解析
细节辨认题。本题考查人造雪的应用越来越广泛的原因。定位句指出,人造雪之所以有如此大的市场不仅仅是人们可以从此不受天气约束,自由享受下雪,还与全球气候变暖有关。故答案为the warming effects ofclimate change。
转载请注明原文地址:https://tihaiku.com/zcyy/3604427.html
相关试题推荐
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Oneofthecompetitivestrategiesinthemarketis______(要最大限度地开发潜在客户)todevelop
Because______(好大学的文凭是好工作的敲门砖),educationisoneofthemostcompetitiveareasin
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
随机试题
A—FreedeliverytoyourdoorB—TollgateC—NoentryD—StrictlynoparkingE—Lugg
[originaltext]W:So,oneofthethingsthatIreallyhavetroubleunderstanding
Privatedoesnotmean【B1】______.Butitdoesmean【B2】______.Publicschool
[originaltext]M:Hi,thisisPaulfromEngland.Firstquestionis:Doyougive
中国证券投资基金业协会在基金管理人登记,基金备案,投资情况报告要求和会员管理等环
最早把"疳"列为脾胃病的儿科医家是A.万全 B.薛铠 C.刘昉 D.董汲
陈某,胃病多年,近日呕吐,吐物多为清水痰涎,脘闷纳呆,头眩心悸,脉滑,苔白腻,宜
催化原核生物tRNA转录的聚合酶是 A.RNA-polIB.RNA-
下列不属于全面推进乡村振兴当前和今后要重点抓好的工作是:A.提升粮食等重要农产品
根据国家外汇管理局公布的《2010年中国国际收支报告》,2010年我国货物贸易顺
最新回复
(
0
)