斜面是一种常见的简单机械在生产和生活中利用斜面提升物体可以省力图示为倾角θ=30的固定斜面用平行于斜面的拉力f=4n将一物体从斜面底 Template




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tomski斜面是一种常见的简单机械在生产和生活中利用斜面提升物体可以省力图示为倾角θ=30的固定斜面用平行于斜面的拉力f=4n将一物体从斜面底 coloring