马赫数是真空連与音速的比值
A.Mach digit is the percent of true airspeed to the speed of sound B.Mach number is the ratio of true airspeed to the speed of sound. C.Mach number is the proportion of real airspeed to the speed of fight.正确答案B
马赫数是真空連与音速的比值
A.Mach digit is the percent of true airspeed to the speed of sound B.Mach number is the ratio of true airspeed to the speed of sound. C.Mach number is the proportion of real airspeed to the speed of fight.正确答案B