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civil engineering airport engineering
1. Speed of
(A): All the above.
(B): an aircraft flying at 2975 km p.h., is called 2.5 Mach
(C): sound at 0°C is 1190 km p.h.
(D): sound at 0°C is called one Mach
(E): sound varies 2.4 km p.h. per degree centrigrade rise in temperature
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