题目内容
（请给出正确答案）
A.山脉
B.数量
C.克服
D.蒙太奇
参考答案
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
网友提供的答案
更多“mountain（）”相关的问题
A、泰山Mount Tai
B、嵩山Songshan Mountain
C、衡山Heng Mountain
D、华山Huashan Mountain
E、恒山Mount Heng
F、黄山Mount Huangshan
G、庐山Lushan Mountain
A、比利牛斯山(les Pyrénées)
B、阿尔卑斯山脉（Alps）
C、孚日山脉（Vosges）
D、安第斯山脉（Andes mountain）
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.
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 thing," 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.
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.
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.
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.
根据下列材料，请回答题
Please Fasten Your Seatbelts
Severe turbulence （潮流 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.
Clear-air turbulence often catches pilots by surprise. Invisible to radar， it is difficult to fore- cast 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 meters 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 thing，" 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 kilometers 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.
What does "clear-air turbulence" in Paragraph 1 probably mean？ 查看材料
A.A not very rough storm.
B.Unexpected disturbed air.
C.A kind of visible storm.
D.A storm over mountain ridges.
There was a house at ______
A、the mountain foot
B、the foot of the mountain
C、the feet of the mountain
D、the mountain's foot
A、Mountain Taishan
B、Mountain Huashan
C、Mountain Hengshan（恒山）
D、Mountain Hengshan（衡山）
A、Qingling Mountain
B、Huangshan Mountain
C、Huashan Mountain
D、Tianshan Mountain
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