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【单选题】

斜激波前气流的法向分速度必定是超音速的,波后( )。

A.
法向速度是亚音速的
B.
合成速度可能是超音速的
C.
合成速度也可能是亚音速的
D.
以上都对
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参考答案:
举一反三

【单选题】超音速喷管是一个( )的管道。

A.
先扩张后收敛形
B.
扩张形
C.
收敛形
D.
先收敛后扩张形

【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.
相关题目:
【单选题】超音速喷管是一个( )的管道。
A.
先扩张后收敛形
B.
扩张形
C.
收敛形
D.
先收敛后扩张形
【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.
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