为什么非固定斜面上的物块从斜面上静止下�,支持力对物体做功? 知乎 Template




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Try and sketch some of theseLamb, Birdhouse, Pastrami, Bonnet, Crazy quilt, Flag, Disco, Record player, Sleepyhead, Wallaby, view more ideas


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tomski为什么非固定斜面上的物块从斜面上静止下�,支持力对物体做功? 知乎 coloring