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Aircraft Rapid Decompression Problems Without question, the rapid decompression of the Qantas Boeing 747 that landed in Mani

admin2013-05-04  40
问题                 Aircraft Rapid Decompression Problems
    Without question, the rapid decompression of the Qantas Boeing 747 that landed in Manila on July 25 was bizarre. Fortunately, large gashes do not often appear in passenger jets. When they do, they tend to happen where there is structural strain (like at door hatches), not in the forward cargo compartment, as in this case with Qantas. The cause of the accident remains a mystery, and the U. S. is sending a team from the National Transportation Safety Board to assist in the investigation in the Philippines.
    But rapid decompressions, in general, are not unheard of—and, as the passengers from the Qantas plane now know, not necessarily as apocalyptic as they seem at the time.
    What happens when your plane suddenly depressurizes? Any dramatic loss of pressure caused by the sudden surge of outside air into the cabin—feels like you are going up a skyscraper in an elevator powered by a rocket. Your ears pop, and the pain can be intense. You may experience some temporary hearing problems, but nothing too serious in most cases.
    At the same time, the plane will likely drop in altitude quite dramatically. But this sensation is actually good news, says Todd Curtis, an engineer and former airline safety analyst at Boeing. It usually means that the pilots are trying to get the plane low enough so that the outside air is breathable for humans. Says Curtis, "It may seem like the aircraft is going through a radical maneuver, and it is radical compared to normal flying, but this is standard protocol."
    Meanwhile, the oxygen masks will probably drop from the ceiling. This, too, may look exceedingly ominous. But you won’t die if you don’t get a mask on, provided you were already generally healthy. "Passing out is about the worst thing that would happen," Curtis says. There are only about 10 to 15 minutes of oxygen on those masks anyway, and they are provided just to help keep you comfortable until the plane reaches a lower altitude, where you can breathe easily and without assistance. The most important thing is that the pilots get their masks on first-and they have been trained to do this much faster than you will get yours on. It is best to put your mask on before helping anyone else, since you only have a matter of seconds before you may lose consciousness.
    As if there weren’t enough going on, it is also quite common to see what looks like smoke in the air. But this is actually fog or mist that comes from the sudden change in pressure.
    The flight can continue on in this surreal fashion for a while and passengers will usually remain relatively calm, as evidenced by video taken inside the Qantas flight. Decompression may be scary, but it is survivable.
According to this passage, ______.
选项 A、the Qanfas Boeing 747 has large gashes at door hatches
B、rapid decompression is apocalyptic
C、passengers should get on their masks in lo to 15 minutes
D、passengers should not help others until they put on their masks
答案D
解析 推理判断题。本题要求综合全文理解来判断各个选项的正确性。第一段就指出了这一次澳航事故发生在前货舱，而不是门舱口，故[A]错误；第二段提到快速减压并非一定就是世界末日，排除[B]；第五段中提到面罩中的氧气只能支持10到15分钟，而乘客需要迅速戴上面罩，否则几秒钟之后就可能失去知觉，可知[C]错误；第五段最后一句指出在帮助别人之前，自己要先戴上面罩，故[D]正确。
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