为什么小木块a从圆弧上�下的过程中,圆弧对小木块的支持力不做功?只有a的重力做功(圆弧光�)求解答? 知乎 Template




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tomski为什么小木块a从圆弧上�下的过程中,圆弧对小木块的支持力不做功?只有a的重力做功(圆弧光�)求解答? 知乎 coloring