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
수압기를 사용하여 재료의 강도를 측정합니다.suhapgireul sayonghayeo jaeryoui gangdeureul cheugjeonghamnida.We use the hydrostatic press to measure the strength of the material.