0.8ร1ร1.2ร1.5ร1.7ร2ร2.5ร5 minโก๏ธ6 min 22 sec5 min 6 sec4 min 15 sec3 min 24 sec3 min2 min 33 sec2 min 2 secIntroduction to Standardization0.8ร1ร1.2ร1.5ร1.7ร2ร2.5ร5 minโก๏ธ6 min 22 sec5 min 6 sec4 min 15 sec3 min 24 sec3 min2 min 33 sec2 min 2 secIntroduction to StandardizationYour user agent does not support the HTML5 Video element.