小总管 发表于 2017-10-21 00:07 应该是弯矩M作用的那个方向。纵向，与4000mm平行。
Undo
Redo
Table
Removeformat
Autotypeset Left Center Right
FloatLeft FloatRight Orderedlist Unorderedlist
手机版|小黑屋|第一证书
GMT+8, 2024-9-27 20:30 , Processed in 0.039634 second(s), 3 queries , Apc On.
Powered by Discuz! X3.2
© 2001-2013 Comsenz Inc.
