薄鋼板不一定比厚的便宜
減重往往要求好材料,很有可能會比原來貴
所有跟帖:
• 這時候, 材料已定, 不是變量。隻是在算哪裏用力, 多厚等 -黃則和- ♂ (0 bytes) () 06/11/2009 postreply 21:40:11
• 這時候, 材料已定, 不是變量。隻是在算哪裏用力, 多厚等 -黃則和- ♂ (0 bytes) () 06/11/2009 postreply 21:40:11
WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2024 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy