送交者: JJZ 于 2008-12-15, 14:35:20:

回答: that is why mach number is used. 由 steven 于 2008-12-15, 14:17:49:

• that is only true in atmosphere, it is quit different at the edge of it. (无内容) - steven (0 bytes) 2008-12-15, 14:47:00 (284291)

加跟贴