salam.bad az tahaye wbs peroje har faliati bar asase weight factor ekhtesas dade shede ye pishrafti ijad mikone.ke in darsade vazni mitune rilai ya zamanio bashe.albate pishrafte zamani taghribAN MELAKI VASE PISHRAFT NIST.VA PISHRAFTE RIALI VA FIZIKI MELAKE AMAL HAST.