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
2023-09-04
64
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. Snpw 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 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the natural formation of snowflakes。
转载请注明原文地址:http://tihaiku.com/zcyy/2985215.html
相关试题推荐
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
Thetelecityisacitywhoselife,direction,andfunctioningarelargelysh
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
Ifsustainablecompetitiveadvantagedependsonworkforceskills,American
Historianswishtheycouldwitnesstherealscenesofhistoriceventsbecauseth
Historianswishtheycouldwitnesstherealscenesofhistoriceventsbecauseth
随机试题
Thefatherwasdelightedtohearthechild______that.A、tosayB、tohavesaidC、
Timesamplingmeansthatresearcherschoosevarioustimeintervalsfortheir
Manychildrenchose"AnimalWorld"astheir______TVprogramme.A、favorB、favorite
某社区有居民986人,吸烟人比较多,社区医生针对这种情况进行干预。经过教育社区中
柬埔寨的洞里萨湖是一个水量季节变化很大的大湖。洞里萨湖北部的吴哥通王城两边有两个
患者,男,27岁。车祸伤及内脏出现循环衰竭症状,经抢救无效死亡。护士进行尸体护理
下列对于仲裁期限的计算正确的有()A:增加、变更仲裁申请的,仲裁期限从受理增加、
运输通道是指存在流向相同的密集( ),有多条运输线路和多种运输方式参与运输的长条
以下关于资本利润率指标的说法错误的是()。A.资本利润率是净利润与净资产平均
莫宁—奥布霍夫长度L是AERMOD模式中表征大气边界层层结的参数,不稳定层结时,
最新回复
(
0
)