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【简答题】What is the atmospheric turbulence and what is its effect on atmospheric optical communication？
提问人：网友klwzly
发布时间：2022-01-07
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A、influenced
B、effected
C、affected
D、impacted
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第2题
The higher the water turbulence such as wave action, the higher the relative number of:
A、Planktonic species.
B、Deposit feeders.
C、Suspension feeders.
D、Primary producers.
第3题
Please stow your ________ as there is some small turbulence.
A、window shade
B、armrest
C、tray table
D、seat back
第5题
Règle du jeu 游戏规则： Tirez au sort et jouez la scène avec vos voisins selon la consigne. 抽签并与同学按要求完成角色扮演任务，请拍摄视频上传。对话者之间的关系可为：邻居、同学、朋友、路人，请使用本单元所学动词进行问答、对话。 关系场景： 1) 邻居 entre les voisins 2) 同学 entre les comrade's 3) 朋友 entre les amis 4） 路人 entre les passants
第6题
Please Fasten Your Seatbelts Severe turbulence (湍流) can kill aircraft passengers. Now, in test flights over the Rocky Mountains, NASA (美国航空航天局) engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
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Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl (用力抛出去) passengers about the cabin. In December 1997, one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 metres in a few seconds.
However, passengers can avoid serious injury by fastening their seatbelts. “It is the only antidote (对策) for this sort of things,” says Rod Bogue, project manager at NASA’s Dryden Flight Research Center in Edwards, California.
The centre’s new turbulence detector is based on lidar, or laser radar, Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect. The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air, the speed equals the plane’s airspeed. But as the particles swirl (打漩) in rough air, their speed of approach increases or decreases rapidly. The rate of change in speed corresponds to the severity (激烈程度) of the turbulence.
In a series of tests that began last month, a research jet flew repeatedly into disturbed air over the mountain ridges (山脉) near Pueblo, Colorado. The lidar detector spotted turbulence between 3 and 8 kilometres ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had “ a comfortable amount of time” to fasten his seatbelt. The researchers are planning to improve the lidar’s range with a more powerful beam. The system could be installed on commercial aircraft in the next few years.
第6题：What does “clear-air turbulence” probably mean? （Paragraph 1）
A．A not very rough storm.
B．Unexpected disturbed air.
C．A kind of visible storm.
D．A storm over mountain ridges.
第10题
【填空题】In the function model of access network defined in ITU-T G.982, there are five successive building blocks in the user data plane, which are______________, ______________, ______________, ______________, ________________.
