问题详情

34 What does Werner J．A．Dahm say about the Hyper-X test flight？
A It was unsuccessful because it lasted only 11 seconds．
B It is a very important event in developing very fast airplanes．
C，It allows people to fly at an altitude of 100,000 feet．
D It can transport cargo quickly and cheaply to outer space．请帮忙给出正确答案和分析，谢谢！