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
기계력은 기계의 성능을 결정하는 중요한 요소입니다.Gigaeryeogeun gigyeui seongneungeul gyeoljeonghaneun jungyohan yosoimnida.Mechanical powers are an important factor that determines the performance of machines.