cdddd:弹性模量及刚度关系
https://mp.weixin.qq.com/s?src=3×tamp=1566515776&ver=1&signature=5l99*3dmQNHDvbCJkvcuKQk6FMYeNGAJph9kDw5aqzKbpJaRdre0V9Yee0ukB-j9aS8Tyqb3P8a38rNEbf3ekpcmH4vMgVvAI75q2B8cNef7flsglxECzAWzp4Op91KW1yBv2BcqsJIul2U19s3q0WmbcSef9Ln .. (2019-08-23 07:17)