首页
登录
职称英语
[originaltext]It is sometimes more difficult to get airplanes off the ground in
[originaltext]It is sometimes more difficult to get airplanes off the ground in
游客
2024-01-21
58
管理
问题
It is sometimes more difficult to get airplanes off the ground in extremely hot weather. But the problem is not the temperature itself or the humidity. It is the air density that can get in the way. Hotter air gets thinner. Thin air makes it more difficult for planes to lift and land safely. This is especially the case with smaller planes. Airplanes take off and stay in the air because of lift—the force from the movement of air under the plane’s wings that pushes it upward. Lou McNally is a professor of meteorology at Embry-Riddle Aeronautical University. When pilots try to take off in extreme heat the planes sometimes cannot lift before the runway ends. And, when pilots try to land when the air is too thin and hot, they can also run out of runway, McNally said.
To fly in high heat, planes must create more power and have larger wings. Airlines can take steps to be able to safely fly in extreme heat. One step is to reduce the plane’s weight by selling fewer seats. That is what American Airlines did during the recent Phoenix heat wave. Airlines can also reduce weight by lowering a plane’s fuel level.
Then the plane can stop somewhere cooler to refuel and take off again. Before they fly, pilots examine measures of what is called density altitude.
These include temperature and humidity. The density altitude is the main issue, but there are other risks that come with flying in hot temperatures.
Questions 16 to 18 are based on the passage you have just heard.
16. What makes planes difficult to get off the ground in extremely hot weather?
17. What can airlines do to safely fly in extreme heat?
18. What does the speaker mainly talk about?
选项
A、The temperature.
B、The humidity.
C、The air density.
D、The air pressure.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3382311.html
相关试题推荐
[originaltext](19)Somepeoplesayifkidsdidn’thavetogotoschool,they’
[originaltext](19)Somepeoplesayifkidsdidn’thavetogotoschool,they’
[originaltext](16)Intoday’sjobmarket,itisnotuncommonforjobseekers
[originaltext](16)Intoday’sjobmarket,itisnotuncommonforjobseekers
[originaltext](16)Intoday’sjobmarket,itisnotuncommonforjobseekers
[originaltext]Beforetherewasthewrittenword,therewasthelanguageofd
[originaltext]Beforetherewasthewrittenword,therewasthelanguageofd
[originaltext]Beforetherewasthewrittenword,therewasthelanguageofd
[originaltext]Beforetherewasthewrittenword,therewasthelanguageofd
[originaltext](19)Somepeoplesayifkidsdidn’thavetogotoschool,they’
随机试题
Inboxes30-36onyouranswersheet,writeYESifthestatementagreeswiththe
Thephrase"men’ssurenessoftheirsexrole"inthefirstparagraphsuggestst
Threatsfromnomadicpeopleinthenorthwere【C1】______throughoutChines
广告正文包含哪些部分()A.引言 B.感谢语 C.主体 D.结尾
邓先生在承租一店铺期间,由于营业需要,欲改变房屋的格局。在征得业主书面同意,经有
基金认购与基金申购的区别不包括( )。A.认购费一般低于申购费 B.认购是按
肝性脑病是指A:肝脏病症并发脑部疾病 B:肝功能衰竭并发脑水肿 C:肝功能衰
我国外汇挂钩类理财产品中,通常挂钩的一组或者多组外汇的汇率大都依据()时间下午3
建设工程监理招标中,招标人与中标人应当依据( )签订建设工程监理合同。A.招标文
根据《民有航空器飞行事故等级》(GB14648-93),按人员伤亡情况以及对航空
最新回复
(
0
)