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手为什么不能穿过桌面
更新时间: 2020-10-11 00:00:00  

手不能穿过桌面是阻力在起作用,是桌面的弹力起作用。因为手要穿过桌面必需用力接触桌面,将引起桌面变形,桌面形变 时会产生方向与外力方向相反的力即弹力,来阻碍外力的作用。人的手不能穿过桌面是桌面的阻力在起作用。

关键词: 为什么 穿过 桌面

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