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
2023-09-05
34
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 mechanism of snow machines imitates______.
选项
答案
the natural formation of snowflakes
解析
同义转述题。本题考查制造人造雪的机械原理。定位句指出,雪炮(枪)是模仿了雪花形成的自然原理。题干中的imitates是原文mimic的同义转述;而snow machines指原文中的snow“canons”or“guns”,故答案为thenatural formation of snowflakes。
转载请注明原文地址:https://tihaiku.com/zcyy/2988159.html
相关试题推荐
Henryremainedcalmand______unaffectedbytheterribleeventsoftheprevious
Severalinternationaleventsintheearly1990sseemlikelyto______,oratleas
Severalinternationaleventsintheearly1990sseemlikelyto______,oratlea
Leadershipisthemostsignificantwordintoday’scompetitivebusinessenvi
Leadershipisthemostsignificantwordintoday’scompetitivebusinessenvi
Leadershipisthemostsignificantwordintoday’scompetitivebusinessenvi
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
Because______(好大学的文凭是好工作的敲门砖),educationisoneofthemostcompetitiveareasin
Allcompetitiveskiandsnowboardingeventsnowtakeplacelargelyonman-ma
随机试题
I’ve___________(向几所美国学校申请了)scholarships.appliedtoseveralAmericanschoolsfor
[originaltext]J:Ienjoyplayingchess.Someofmyfriendsaregoodplayers.S:
Ifyousitalldayatanofficeandworryaboutitseffectonyourweightand
D
用水准仪望远镜在站位处(甲)向塔尺站位处(乙)读取,视距丝m、n截取塔尺上的长度
A.戊巴比妥 B.地西泮 C.司可巴比妥 D.硫喷妥钠 E.苯巴比妥用于
共用题干 第三篇InternetShoppingInternetshopp
关于企业管理信息系统的说法,正确的有()。A:用户是信息管理的对象 B:用户是
影响混凝土强度的因素主要有原材料及生产工艺方面的因素。其中原材料方面的因素包括(
采用建设项目工程总承包时,从招标开始至确定合同价的基本工作程序的第一步是()。A
最新回复
(
0
)