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
2023-08-28
17
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.
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.
Snow manufacturing is in great demand. 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amore durable and consistent surface。
转载请注明原文地址:https://tihaiku.com/zcyy/2966143.html
相关试题推荐
Oneofthecompetitivestrategiesinthemarketis______(要最大限度地开发潜在客户).todevelo
______(只有积极投身社会实践)canthestudentsbecompetitiveinthejobmarketaftergrad
【S1】[br]【S12】A、partlyB、hardlyC、largelyD、slightlyC程度副词辨义。根据语义判断,这句话的意思是:“人们
______(只有积极投身社会实践)canthestudentsbecompetitiveinthejobmarketaftergrad
Thesubsequentevents______(再次证明了我的猜疑是对的).confirmedmysuspiciononceagain此句
【S1】[br]【S19】A、competitiveB、controversialC、distractingD、irrationalB语义衔接题。本
Thefirstparagraphindicatesthat[br]noncompetitiveexercising细节归纳题。由原文可知.从事非
Pressure1.现在的年轻人面对着很大的压力2.压力对年轻人来说有好处,也有不利之处3.你是如何对付压力的Inthecompetitive
[originaltext]Atonetime,computerswereexpectedlargelytoremovethene
AlmosteveryonewhoworriesaboutAmerica’s"competitiveness"intheworlds
随机试题
Williamhascuthissmoking()tofivecigarettesaday.A、downB、inC、offD、outA
Wheneverwehearofanaturaldisaster,wefeelsympathetictothepeopletobe
钢筋接头应设在受力较小区段,不宜位于构件的最大()处。A.拉力 B.压力
为了实现QoS控制的资源预约协议RSVP,下面描述中正确的是() A.由
癫癎部分性发作,不包括A.感觉性发作 B.运动性发作 C.植物神经性发作
某中学甲班学生中,所有喜欢奥数的同学也都喜欢下围棋。 若以上陈述为真,再加上以
昆体良的《雄辩术原理》被称为()。 A.教育学的雏形 B.世界上第一部专门
患者46岁,右侧腮腺反复肿大两年,自述每于进食时右侧腮腺憋胀感,并伴轻微疼痛,晨
在装饰装修施工过程,属于建筑结构增加了线荷载的( )。A.室内增加装饰性石柱
女,29岁,患甲状腺功能亢进GravesB病,突然出现双下肢不能动。检查:双下肢
最新回复
(
0
)