This Internet Slang page is designed to explain what the meaning of DFKM is. The slang word / acronym / abbreviation DFKM means... . Internet Slang. A list of common slang words, acronyms and abbreviations as used in websites, ICQ chat rooms, blogs, SMS,
人造卫星以第一宇宙速度（约8 km/s）运动，问它的质量和静质量的比是多少？解：由 ，得