0.8ร1ร1.2ร1.5ร1.7ร2ร2.5ร12 minโก๏ธ15 min12 min9 min 49 sec7 min 51 sec6 min 56 sec5 min 53 sec4 min 43 secIntroduction to Application0.8ร1ร1.2ร1.5ร1.7ร2ร2.5ร12 minโก๏ธ15 min12 min9 min 49 sec7 min 51 sec6 min 56 sec5 min 53 sec4 min 43 secIntroduction to ApplicationYour user agent does not support the HTML5 Video element.