Kev phom sij hluav taws kub yog qhov uas txhua tus yuav tsum tau ceev faj hauv peb lub neej niaj hnub, thiab qhov rooj hluav taws kuj tau dhau los ua qhov kev xaiv ntawm ntau tus neeg. Qhov sib txawv loj tshaj plaws ntawm cov qhov rooj hluav taws kub thiab cov qhov rooj hluav taws steel yog tias lawv siv cov khoom sib txawv, thiab lawv siv cov txheej txheem sib txawv ntawm cov nplaim hluav taws sib txawv rau kev tiv thaiv hluav taws. Txais tos kom sab laj peb.

1 teev hluav taws nyob qhov rooj zawv zawg,1/6 hluav taws nyob khib nyiab chute / thoob khib nyiab chute qhov rooj,180 feeb hluav taws qhov rooj,90mins hluav taws ntsuas qhov rooj ntoo nrog 4 “pob khawm,120 feeb steel hluav taws ntsuas qhov rooj,180hrs hluav taws qhov rooj,1 teev hluav taws nyob qhov rooj zawv zawg,hluav taws tiv thaiv qhov rooj,120 feeb steel hluav taws ntsuas qhov rooj,tawm qhov hluav taws kub ntsuas qhov rooj,180 feeb hluav taws qhov rooj,1.5 teev hluav taws ntsuas qhov rooj,120 feeb steel hluav taws ntsuas qhov rooj,prehung internal hluav taws qhov rooj,1 teev hluav taws nyob qhov rooj zawv zawg,industrial hluav taws nyob qhov rooj steel,180 feeb hluav taws qhov rooj