如何判定有几根绳子有效拉动重物(即在“力就是物体和动滑轮总重的n分之一”这一定律中,如何判断n是几,不要只告诉我画条线来判断)
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 23:06:48
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