Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
탄력계를 사용하여 재료의 탄성을 측정합니다.tanryeokgye-reul sayonghayeo jaeryo-ui tanseong-eul cheugjeonghamnida.We use the elastometer to measure the elasticity of the material.