题目内容：
What did Werner J. A. Dahm of the University of Michigan say about the Hyper-X test flight?
参考答案：
答案解析：
单选题：What did Werner J. A. Dahm of the University of Michigan say
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选项所给的四个图形，哪一个可由题于所给的图形组合而成?
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很多时候，政策及政策建议的基础不过是主观的信念。所以，究竟是需求管理政策更好，还是供给刺激政策更好，不大容易判断。问题的关键在于，这个“好”是指什么?是从多长的
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