如图所示将光�的小球放在竖直挡板和倾角为a的固定斜面间.若缓慢转动挡板至与斜面垂直则在此过程中 A.球对斜面的压力逐渐减小b.球对挡板 Template




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tomski如图所示将光�的小球放在竖直挡板和倾角为a的固定斜面间.若缓慢转动挡板至与斜面垂直则在此过程中 a.球对斜面的压力逐渐减小b.球对挡板 coloring