质量为m的木块从半径为r的半球形碗的碗囗下�到碗底的过程中如果由于�擦力的作用使得木块的速率不变如图所示那么 A.因为速率不变所以木块 Template




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tomski质量为m的木块从半径为r的半球形碗的碗囗下�到碗底的过程中如果由于�擦力的作用使得木块的速率不变如图所示那么 a.因为速率不变所以木块 coloring