【经】 有形资产

结果表明，合理设计板叠的结构和合理选择板叠的材料，可以使得系统在较低的温度下起振。

不知为啥出现负值，修改了约束，载荷反正还是不行，请大哥们帮我看一下，啥地方出问题了？

spring made of foam-like material

heat insulating material

elastic woven material

combining unit material supplied by several conveyers

material transfer

material price variance

thermoplastic material

mix distributor (mixed material distributor)