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更多“Règle du jeu 游戏规则： Tirez au so…”相关的问题
A、我们的规划是培训各种求职人员，涉及到的商务、营销以及各种工作团队人员都需参加。
B、我们设定的项目是培训所需要的替补人才，涉及商务、营销以及交际和团队领导等方面。
C、我们的项目旨在培养商务和营销各方面的合格后备人才，及交际人才和团队领导人才。
D、我们正在规划选拔各个商务领域的求职人员，他们都需要具有交际和领导团队的能力。
A、Fixed-alternative questions
B、Scale questions
C、Open-ended questions
D、All of the above
A、the immortal quality in love and death is contrasted to the briefness in life
B、the poem praises the beauty of nature and the innocence of the child
C、the poet remains a placid and accepting attitude towards death
D、the poet falls in deep love with the beautiful lady and wants to stay with her forever
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.
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