皮皮学，免费搜题
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【单选题】
对于翼型，通过仿射变换（普朗特-格劳特变换）可以把二维定常、等熵亚声速位流问题的线化速度位方程变为对于不可压流所满足的拉普拉斯方程。经过该变换后，以下参数中保持不变的是（ ）。A.
相对厚度
B.
相对弯度
C.
迎角
D.
弦长
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】How does the man support his schooling?
A.
By his language skills.
B.
By a restaurant's donation.
C.
By an academic scholarship.
D.
By a part-time cook job.
【简答题】阅读理解。 One day Mr Jackson took Paul to his favourite restaurant. It was a French restaurant. The waiter was from France. But he didn't speak to them in French.'Would you like to see the menu?' he asked...
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