বিমের রডের A to Z চেক জানতে হলে ভিডিও দেখুন।  

cross section plan a takle kibave check korte hoy aita dekalam.then parer vediotete long section dekabo.apnara amar sate takben ai vedio guli dekle kisu experience gather hobe.
amar parisrom sartok hobe.
ami building er jabtio sob dekabo.
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