见补充(不要用极限法)半圆柱体P放在粗糙的水平面上,有一挡板MN,延长线总是过半圆柱体的轴心O,但挡板与半圆柱不接触,在P和MN之间放有一个光滑均匀的小圆柱体Q,整个装置处于静止状态,
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/06 11:43:40
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