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【单选题】
马赫锥面是超音速流动中( )的分界面。
A.
静止和流动区域
B.
可压缩与不可压缩区域
C.
扰动区与未扰动区
D.
超音速和亚音速区域
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】第二篇 Flying the Hypert Skies A little airplane has given new meaning to the term "going hyper. " The Hyper-X recently broke the record for air-breathing jet planes when it traveled at a h...
A.
It indicated the birth of a very fast airplane.
B.
It was self-powered, so it lasted only 11 seconds.
C.
It can transportcargo quickly and cheaply to the brink of space.
D.
It is a major milestone in the journey of making a new type of very fast airplanes.