safety first with CPQRA ebook (chemical process quantitative risk analysis)... 
arfiyan
says
innallaha ma'a shobirin.. hehe tumben saya sadar
kcireluas
says
waaaa... semngat rio... 
hari gini masih ngurusin safety bung,,,gak zaman,,,haha
ahaha,,doakan kawan2... 
dinyfadlilia
says
Rio...yg iso kontur udah belum???? 
oi ada rio