ASTM A888 ṣe ayẹwo awọn ohun elo irin simẹnti ṣaaju gbigbe, ti a bo jẹ idapọmọra.

ASTM A888 ṣe ayẹwo awọn ohun elo irin simẹnti ṣaaju gbigbe, ti a bo jẹ idapọmọra.——Oṣu kejila ọjọ 23, Ọdun 2019