Los ntawm kev ntseeg tsis tau ntawm kev ua tau zoo thiab muaj zog ntseeg hauv kev tsim kho tshiab, Tankii tau ua cov khoom sib txuas ntxiv thiab kev nce qib hauv cov khoom siv alloy. Qhov kev nthuav dav no yog lub sijhawm tseem ceeb rau tankii kom ua kom pom nws cov kev ua tiav tshiab, nthuav dav nws qab ntug, thiab ...