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  3. The Hyper-X broke the record because What does NASA plan to do?

The Hyper-X broke the record because What does NASA plan to do?

admin2009-05-21  47
问题 The Hyper-X broke the record because
What does NASA plan to do?
选项 A、To build one more Hyper-X aircraft.
B、To carry out three more Hyper-X experiments.
C、To make the aircraft fly higher and longer.
D、To test another hypersonic flight at 10 times the speed of sound.
答案D
解析 从文章的最后一段话可以推断，NASA计划下一次研发的超音速飞机速度达到声速的十倍。
转载请注明原文地址:https://kaotiyun.com/show/hYhd777K
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