某同学设计了一个如图1所示的装置来测定�块与水平木板间的动�擦因数其中a为�块b和c是钩码个数可调.a的左端与打点计时器的纸带相连通过 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. : )

tomski某同学设计了一个如图1所示的装置来测定�块与水平木板间的动�擦因数其中a为�块b和c是钩码个数可调.a的左端与打点计时器的纸带相连通过 coloring