?????????? ??????? ?????????? (I-Beam) ??? ??????????????????????????? ??? ?????????? ????????????????????? (I) ?????????? ?????????????????????????????????? ??????????????????????????????????? ????????????????????????????????????? ???????????????????????????????????? ???? ???????????????? ?
ทำความรู้จักกับเหล็กไอบีม (I-Beam) คู่แฝดเหล็กเอชบีม (H-Beam)
?????????? ??????? ?????????? (I-Beam) ??? ??????????????????????????? ??? ?????????? ????????????????????? (I) ?????????? ?????????????????????????????????? ??????????????????????????????????? ????????????????????????????????????? ???????????????????????????????????? ???? ???????????????? ?
ทำความรู้จักกับเหล็กไอบีม (I-Beam) คู่แฝดเหล็กเอชบีม (H-Beam)
?????????? ??????? ?????????? (I-Beam) ??? ??????????????????????????? ??? ?????????? ????????????????????? (I) ?????????? ?????????????????????????????????? ??????????????????????????????????? ????????????????????????????????????? ???????????????????????????????????? ???? ???????????????? ?