楼主: Jwang
|
|
| ||
| ||
| ||
| ||
| ||
点评
就是上面那张图,问题是得标明那几个大屁股状的弧形代表什么....
| ||
| ||
点评
整个过程,摩擦力可视为恒定,因为针压一样,摩擦系数也基本一样( 为方便讨论,看成恒定).
| ||
| ||
| ||
GMT+8, 2024-10-6 06:27, Processed in 0.051877 second(s), 23 queries.
Powered by Discuz! X3.2
© 2001-2010 Comsenz Inc.