单项选择题
A.Rmin B.Rmax C.RPMmax D.RCFmax E.RCFmin
A.410000g B.510000g C.610000g D.710000g E.810000g
A.向心运动 B.匀速圆周运动 C.离心运动 D.变速圆周运动 E.保持不动