单选题：What kind of an engine did the Hyper-X use?

题目分类：理工类
题目类型：单选题
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What kind of an engine did the Hyper-X use? A．A jet engine that gets oxygen from the ai
B．A scramjet engine that doesn't carry its own oxygen suppl
C．A rocket engine that carries its own supply of oxyge
D．A jet engine that uses no oxyge

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