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เรื่องน่ารู้เกี่ยวกับราวกันตก
???????????????????????????????????????? ? ???????? ?????????????????????????????????????????? ?????????????? ???????????????????????????????????????? ????????? ?????????????????????????????????????????????????????????????????????????????????????? ?????????????????????????????????????????????????????????????? ???????????????????????????
ระบบเคลือบผิวหน้าด้วยด้วยโพลียูรีเทน (Polyurethane) ดีอย่างไร
???????????????????????????????? ???????????? ???????????????? ????????????????????? ??????????????? ????????????????????????? (?????????????? -40 ???????????? ??? 140 ????????????) ??????????????????????????????????????????????????? ????? ???????????????????????????????? ??????????????????????????????????? ?????????????? ??????????????