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力的作用使得木块速率不变则 A.因为速率不变所以木块的加速度为 Template




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tomski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力的作用使得木块速率不变则 a.因为速率不变所以木块的加速度为 coloring