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
장력계를 사용하여 물체의 장력을 측정할 수 있습니다.jangnyeokgye-reul sayonghayeo mulche-ui jangnyeok-eul cheugjeonghal su itsseumnida.You can use a tensiometer to measure the tension of an object.