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
환원제는 화학 반응에서 산화제를 줄이는 역할을 합니다.hwanwonjeneun hwahak ban-eungeseo sanhwajeul julineun yeogaleul hamnida.A reducing agent plays a role in reducing the oxidizing agent in a chemical reaction.