Cov lus piav qhia luv luv:

Hlau saws tes yog qhov haum rau lub ru tsev thiab phab ntsa kab teeb ntawm steel qauv engineering. Kev ncaj ncaj feem ntau hais txog cov hlau hloov sib txuas uas txuas nrog steel purlins, piv txwv li cov ntxig sib xyaw steel, txhawm rau txhim kho kev ruaj ntseg ntawm purlins thiab ua rau purlins tsis tshua muaj kev puas tsuaj thiab kev puas tsuaj nyob rau hauv qee yam sab nraud. Muaj cov kab pheeb ces kaum kev txhuam (txhais tau hais tias 45-degree khoov ntawm lub ntsia hlau xov) thiab kev zawm hniav ncaj (piv txwv li tag nrho yog ncaj). Tom qab kub kub galvanizing kho, antirust nyhuv tiav.