如图所示在倾角为θ的斜面上方的a点处放置一光�的木板abb端刚好在斜面上.木板与竖直方�ac所成角度为α一小物块自a端沿木板由静止�下 Template




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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


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tomski如图所示在倾角为θ的斜面上方的a点处放置一光�的木板abb端刚好在斜面上.木板与竖直方�ac所成角度为α一小物块自a端沿木板由静止�下 coloring