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
측고법은 지구의 고도를 측정하는 방법입니다.Cheuggobeob-eun jiguu-ui godeul-eul cheugjeonghaneun bangbeob-imnida.Altimetry is the method of measuring the altitude of the Earth.