题目内容
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A sonic boom is like every sound in that it is ______.
A．explosive
B．caused by compressed tar
C．a pressure disturbance
D．shock wave
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更多“A sonic boom is like every sou…”相关的问题
A sound is a pressure disturbance: a sonic boom, like other explosive sounds, is the result of an abrupt change in pressure. An airplane in subsonic flight produces weak changed in pressure, but because these disturbances travel at the speed of sound, they move faster than the airplane and stay in front of it. In effect, these disturbances warn the air to get out of the way, and the an does just jet, however, gets ahead of its own pressure disturbances. Consequently a wave of suddenly com pressed air--a shock wave--builds up and is thrown off like the wave ;hat spreads from the bow of a speedboat.
Can sonic booms be eliminated？ The answer is a categorical negative--they are an innerent(内在的) part of supersonic flight--but the sonic boom probably can be reduced; government and private research is now under way to improve understanding of the sonic boom. If and when the booms can be reduced to tolerable levels, commercial supersonic transports can come rata service.
Before commercial airliners travel faster than sound, problems must 0e solved regarding ______.
A．design
B．Construction
C．operation
D．all of the above
An appropriate title for this passage would be ______.
A．The Sonic Boom
B．Air and Its Effects
C．Faster Than Sound
D．Problems Facing Aviation Today
To which of the following is the author likely to agree？
A．A now boom, on the horizon.
B．Tighten the belt, the single remedy.
C．Caution all right, panic not.
D．The more ventures, the more chances.
The coming of age of the postwar baby boom and an entry of women into the male-dominated job market have limited the opportunities of teenagers who are already questioning the heavy personal sacrifices involved in climbing Japan's rigid social ladder to good schools and jobs.
A classic economic example of zero-sum boom (Paragraph 3) connotes ______.
A．economic slack.
B．continued strength.
C．economic recovery.
D．job security.
