用水平推力推一个箱子匀速上斜坡,推力做的总功怎么算?可以算�擦力大小吗? 知乎 Template




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tomski用水平推力推一个箱子匀速上斜坡,推力做的总功怎么算?可以算�擦力大小吗? 知乎 coloring