8.质量为m的石块从半径为r的半球形的碗口下�到碗的最低点的过程中由于�擦力的作用使得石块的速度大小不变如图所示那么 A.因为 Template




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tomski8.质量为m的石块从半径为r的半球形的碗口下�到碗的最低点的过程中由于�擦力的作用使得石块的速度大小不变如图所示那么 a.因为 coloring