How is the critical ach number defined?
A、ThecriticalMachnumberisthatfreestreamMachnumberatwhichlocalsonicflowisfirstachievedonthewingsurface.
B、ThecriticalMachnumberisinitialbuffetspeed.
C、ThecriticalMachnumberistransonicindex.
发布时间：2024-09-18 02:16:25
