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.
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.