风雨无阻 发表于 2017-3-9 09:20 那就是绕x轴旋转平面,也就是以弯矩旋转轴为中性轴的平面
Undo
Redo
Table
Removeformat
Autotypeset Left Center Right
FloatLeft FloatRight Orderedlist Unorderedlist
手机版|小黑屋|第一证书
GMT+8, 2024-9-29 09:05 , Processed in 0.020640 second(s), 4 queries , Apc On.
Powered by Discuz! X3.2
© 2001-2013 Comsenz Inc.