在如图所示的四种情景中人对物体做功的是 A.提着水桶水平行走b.举着杠铃原地不动c.用力却搬不动石头d.推着小车水平匀速前进——青夏教育 Template




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tomski在如图所示的四种情景中人对物体做功的是 a.提着水桶水平行走b.举着杠铃原地不动c.用力却搬不动石头d.推着小车水平匀速前进——青夏教育 coloring