????????????? ???????????? (Projector Screen) ????????????????????????????????????????????????????????? ??????????????? ??????????? ??????????????????????????????????????? ???????????????? ???????????????? projector ????????????? ??????? ?????????????? ??????????????????????????????????? ????????? ?????????????????
เพราะเหตุใดพรีคาสท์คอนกรีตสำเร็จรูปถึงนิยมนำมาสร้างโกดัง โรงงาน
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