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
이 실험에서는 대조표준을 사용하여 결과를 비교했습니다.i silheomeseoneun daejopyojeon-eul sayonghayeo gyeolgwa-reul bigyohaessseubnida.In this experiment, we used a control standard to compare the results.