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  3. The Hyper-X broke the record because Which of the following is NOT true of the scramjet engine?

The Hyper-X broke the record because Which of the following is NOT true of the scramjet engine?

admin2009-05-21  44
问题 The Hyper-X broke the record because
Which of the following is NOT true of the scramjet engine?
选项 A、It has been used on passenger planes.
B、The air it breathes does not put out the combustion flames.
C、It works at speeds greater than five times the speed of sound.
D、It goes as fast as a rocket.
答案A
解析 答案在本文第三段。本段内容中比较了喷气式飞机，火箭和超音速飞机所使用发动机的差异，其中本段第二句话提到喷气式飞机和客机的发动机一样，都需要从空气中获取氧气，因此可以推断超音速飞机的发动机——超音速冲压式喷气发动机不会用在客机上．
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