4.on a turntable, a record of radius 6 inches is rotating at the rate of 45 : revolutions per minute. ... 請問題目意思和解法? ... <看更多>
Search
Search
4.on a turntable, a record of radius 6 inches is rotating at the rate of 45 : revolutions per minute. ... 請問題目意思和解法? ... <看更多>