Dab tsi yog 90 min steel hluav taws kub rated qhov rooj?

Lub 90 feeb hluav taws yog siv tau daim ntawv lo tau thiab yog hu ua "pa taws thiab cua tshuab tswj qhov rooj sib tham". Nyob ntawm cov code hauv zos thiab qhib kev qhib daim ntawv thov, cov qhov rooj no tuaj yeem sau raws li lossis tsis muaj lub tsheb ciav hlau hose. 90 feeb nrog cov kwj dej hose: cov no tau ua tiav qhov kev ntsuas hluav taws li 90 feeb, cov qauv hose hluav taws kub uas tau hais tias lub xeev hluav taws kub ".