如图所示斜面体a静置于水平地面上其倾角为θ=450上底面水平的物块b在a上恰能匀速下�.现对b施加一个沿斜面�上的力f使b总能极其缓慢的 Template




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tomski如图所示斜面体a静置于水平地面上其倾角为θ=450上底面水平的物块b在a上恰能匀速下�.现对b施加一个沿斜面�上的力f使b总能极其缓慢的 coloring