| 释义 |
Examples:Mach (aeronautics), unit of speed based on speed of sound = 1 Mach = 1224 km per hr—Herz (Hz) or cycles per second, unit of frequency—Mach number, multiples of speed of sound used as unit in aeronautics, with 1 Mach = 1224 km per hr—tex, unit of fiber density used in textile industry defined as mass in grams per 1000 m of fiber (loan)— |