3.质量为m的木块从半径为r的半球形的碗口下�到碗的最低点的过程中如果由于�擦力的作用使木块的速率不变那么 A.因为速率不变所以 Template




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tomski3.质量为m的木块从半径为r的半球形的碗口下�到碗的最低点的过程中如果由于�擦力的作用使木块的速率不变那么 a.因为速率不变所以 coloring