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
3
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 advantage of man-made snow over its natural counterpart is that it can be tweaked to make______.
选项
答案
a more durable and consistent surface
解析
同义转述题。本题考查人造雪的优势。文章开头就提出,人造雪广泛应用于竞赛中,与天然雪不同,人造雪可以形成更持久耐用的表面,并维持这种状况,故答案为a moredurable and consistent surface。
转载请注明原文地址:https://tihaiku.com/zcyy/3604424.html
相关试题推荐
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Because______(好大学的文凭是好工作的敲门砖),educationisoneofthemostcompetitiveareasin
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
随机试题
大约在影片设定年代的15年后,一场毫无预兆的地震给了罗马区致命一击。(blowto)ThebiggestblowtoRoma’sfortunesc
灾区完成恢复重建任务的时限为()A.三个月 B.六个月 C.一年 D.一
以下对n-3脂肪酸的叙述,正确的是A.n-3脂肪酸是指含3个双键的脂肪酸 B.
某商业企业进货价值200万元,全部售出后得到销售收入280万元,则该商业企业总产
经纪行为中最原始的一种方式是( ),其特点是经纪人在撮合交易成功之前与委托人之
Thechangeinthatvillagewasmiraculou
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
《精神卫生法》属于我国法律体系中的()。A.行政法 B.民法 C.刑法 D
案例三 一般资料:求助者,男性,23岁,未婚。 案例介绍:求助者因大学毕业一
监理工程师在考核设计单位资质时,检查其营业执照的重点有()A、专业资格 B、有
最新回复
(
0
)